1 How long after the formation of Earth did the first life appear?
2 Suggest how we know when the different kinds of organisms first appeared on
Earth.
Fears ago
mple animal-like
red.
3 Up to about 3000 million years ago, there was no oxygen in the Earth's
atmosphere. Today, about one fifth of the atmosphere is oxygen gas.
Use the information on page 6 to suggest what caused this change.

Answers

Answer 1

Answer:

1.After 10 years

2.we have our ancestors who see it

3.the change was caused by the trees and the good nature surrounds our planet

Note that science believe that every living organisms on earth is made by bacteria


Related Questions

how to conserve our environment and prevent climate change?
10sentences​

Answers

Answer:

Opt for eco-friendly options like solar energy and win power. Take up the habit of recycling and reusing. Do not throw away things instead learn to reuse them properly. Further, carpool with your neighbors and relatives to not contribute to automobile exhausts and emissions. Eliminate Waste from Lunches, Stop Littering.,Reduce Paper Consumption., Save Electricity.,Save Water.,Swap Regular School Supplies.,Bring Reusable Bags to the Grocery Store., Walk to School or Take a Bike, Avoid Taking Cars or Carpool when possible. Humans can adapt to climate change by reducing their vulnerability to its impacts. Actions such as moving to higher ground to avoid rising sea levels, planting new crops that will thrive under new climate conditions, or using new building technologies represent adaptation strategies.

Explanation:

Can somebody help with this please I can’t find the answers and my teacher is no help

Answers

Answer:

Fossa -> D

Head-> E

Tubercle-> C

Condyle -> A

Epicondyle -> B

Explanation:

whats genetics and breeding

Answers

Answer:

Genetics- this is the scientific study of genes and heredity.

Breeding-  The production of offspring by animals.

What would be the dimensions of a Punnett Square depicting a dihybrid cross?

Answers

Answer:

for a monohybrid cross, you are crossing two alleles with two alleles. in a dihybrid cross, you are crossing four alleles with four alleles.

heloo can you all help me .which one the correct answer..

India: Gujarat Kite Festival

Read the passage and answer the following questions

1. When is the Gujarat Kite Festival?

2. What was the lantern that tied to the string known as?

3. Why do they celebrate Gujarat Kite Festival?

4. What was the importance of the celebration of Makar Sankranti?

5. Who introduced Uttarayan?

6. How many people participate in the whole festival?

7. Why do visitors come from around the world?

8. What is the name of the kite festival that is held in America?​

Answers

Answer:

1.a) 14 January

2.a) paper lanterns

3.a) The kite festivals signify Gujarat's cultural strength and like the kites, Gujarat soars high to touch the skies to be the best in the world.

4.a) Uttaryan marks the end of long winter. the special significance attached to the celebration of Makar Sankranti
5.a) I don't know this answer sorry

6.a)8 to 10 million people participate

7.a)They come to take part in the celebration
8.a)The blossom kite festival

Explanation:

Hope it helps pls mark as brainliest (Crown)

is it safe to eat something from a dirty floor.. I'm worried cuz I did :D , I raged so I threw my food on the floor and I was out of my mind when I continued eating it because I was so angry... ​

Answers

Answer:

If your floor was clean then it should be fine, it's gross, but normally it's fine.

Explanation:

The bacteria on the floor isn't normally harmful toward people but if you have a compromised immune system then you could get sick.

Answer:

yes and no

Explanation:

there are good bacteias in this world and there is bad bacteria it is dangerous because the unkown virusus and bad bacterias can be found in the floor or ethier cannot be found in the floor it depends how much cleaning it is going through so yea it depends and another thing that is confirmed is how long it has been in the floor

TRUE or FALSE: If the Earth did not rotate major currents of wind and water would go straight north and south without curves. ​

Answers

The answer would be False

9. On some small islands in the Pacific Ocean, the average sea level is rising on the beaches little by little each year. Residents of the islands are worried that their island, and their homes, may become flooded in a few years. What is the most likely cause for the water level to increase?
a. They are getting more rain in their area.
b. The tides are more dramatic because of the number of full moons they have experienced.
c. Ice from the North and South poles is melting and adding to the water in the ocean.
d. The waves are bigger because of increased winds.

10. Hurricanes are large storms that form over warm waters out in the ocean. Hurricanes are associated with low-pressure regions in the atmosphere. How does the low pressure associated with a hurricane help them to grow big and powerful?
a. Air in the atmosphere tends to move toward low-pressure regions, which would increase the winds surrounding a hurricane.
b. Low-pressure regions push away other air in the atmosphere, which would make the hurricane bigger.
c. Low-pressure air heats up the water and therefore makes the hurricane stronger.
d. Low-pressure conditions means slow winds, which makes the hurricane stronger.

11. Based on the northern location of England on the map, it appears that it would have a cold, harsh climate. In reality, England has a mild climate because of the warm Gulf Stream current in the Atlantic Ocean. How does the Gulf Stream current help keep England's climate mild?
a. The warm water of the Gulf Stream warms the land of England where they meet.
b. The warm Gulf Stream waters heat the air over the ocean, which then moves over England.
c. The warm Gulf Stream waters make the air very humid, which results in a milder climate in England.
d. The warm Gulf Stream waters attract the cold air from England, thus keeping England mild.

12. The atmosphere surrounding Earth helps to maintain the various climates found around the world and keeps Earth from becoming extremely cold all over. How does the atmosphere help to keep Earth insulated and warm?
a. The atmosphere creates heat as Earth moves through space, helping to insulate Earth.
b. The atmosphere traps the heat generated by Earth's core and helps maintain Earth's climate.
c. The atmosphere helps spread the warmth from the water near the equator to other parts of Earth.
d. The atmosphere helps trap heat energy from the Sun and energy radiated from Earth to maintain the climate.

13. Convection currents in the atmosphere influence many weather patterns. What property of the air has the most influence on convection currents?
a. the direction of the wind
b. the velocity of the wind
c. the temperature of the air
d. the mass of the air

14. When nitrogen is returned to the soil when dead plants decompose, the interaction is between which two spheres?
a. Hydrosphere and geosphere
b. Cryosphere and geosphere

Answers

Answer:

the answer is always c trustttt

In ancient Greece, Aristotle developed a system of classification which was used for the next 2000 years to describe relationships between living things. Which of the following questions would be most difficult to answer based on Aristotle's classification of living things?

Are cows more complex than oak trees?
Are tomato plants higher or lower than snails?
Which species shows less complexity, a cat, or a dog?
Which organism is lower, a squirrel or a lobster?

Answers

the anserw should be option c

Answer:

Which species shows less complexity, a cat or a dog?

Explanation:

took the exam and got it right ;)

1.
Which of these would not be used by a
scientist to determine the evolutionary
relationship between two species?
A. bone structure
B. fossils
C. DNA
D. population size

Answers

Answer:

Population size should be the correct answer

Explanation:

what would this answer be, i’ll give you brainlist

Answers

The answer for this would be B(Karyotype)

One shrimp was introduced into a tube with pond weed and the tube was placed in a bright light for 5 hour what would the color be if we add hydrogen carbonate

Answers

sorry i cant help u with that

Describe how fossil fuels are used to produce electricity, and explain how an electric generator work

Answers

Answer:

Fossil fuel power plants burn coal or oil to create heat which is in turn used to generate steam to drive turbines that generate electricity. These plants generate electricity reliably over long periods and are generally cheap to build.

25. (10.04 MC)
Which of the following items should be included in a family preparedness plan?
1. A survival kit
II. An evacuation plan
III. A list of valuable furniture
IV. A list of emergency contacts
(1 point)
I and Il only
II and III only
I, II, and III
I, II, and IV

Answers

answer choice d: I, II, IV

Answer:

I,II and IV

Explanation:

A Survival kit with everything needed for emergencies. contacts of family and doctors and a plan to get to safety.

To the base pair given write the correct matching base pair for
DNA across from it in the text box provided

Answers

AT, GC

Explanation:

Adenine (A) pairs with Thymine (T).

Guanine (G) pairs with Cytosine (C).

A - T

C - G

T - A

T - A

G - C

C - G

hope this helps you!

The condition that is most likely causing M’Kenna’s symptoms is

Answers

Jenna symptoms is tragic

How would filling in
wetland to create a field affect the surrounding environment?

Answers

Answer:

The filling in a wetland can have bad effects, such as burring the wetland vegetation, increasing the elevation, and eliminating periodical inundation of the wetland.

Explanation:

Filling in a wetland can be done with various types. One of them is communal waste. Also, the construction materials are disposed of in wetland areas.  

This can produce dangerous chemical elements and release toxins. Filling in the wetland can cause the loss of these areas and the fertile lands used for agriculture.

J~

Modern humans first appeared about ____ years ago.
A. 2 billion
B. 200,000
C. 20,000
D. 2 million

Answers

Answer:

200,000

Explanation:

I searched and it said 300,000, so thats my best guess.

Answer:

200,000 thousand years ago

Explanation:

Meiosis makes?
a. somatic cells
b. squamous
c. gametes

Answers

Meiosis is a type of cell division that reduces the number of chromosomes in the parent cell by half and produces four gamete cells. ... The process results in four daughter cells that are haploid, which means they contain half the number of chromosomes of the diploid parent cell. So is C

Answer:

C

Good Luck!!‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ 

give ways for increasing and reducing friction​

Answers

Explanation:

Methods to increase or reduce friction

Grease is added between the moving parts in machines, to reduce friction. Another method of reducing friction is by using bearings. When ball bearings are introduced between two surfaces friction is reduced because of the freely rotating metal balls.

Answer:

Methods to increase or reduce friction

Grease is added between the moving parts in machines, to reduce friction. Another method of reducing friction is by using bearings. When ball bearings are introduced between two surfaces friction is reduced because of the freely rotating metal balls.

explain biotic components of wetland ecosystem

Answers

Plants, animals, microbes, and all other living organisms make up the biotic aspects of wetlands. Amphibians (particularly in wetlands), reptiles, birds, insects, and mammals are examples of animals. Mangrove, water lilies, cattails, sedges, tamarack, black spruce, cypress, and gum plants are examples of plants.

What 3 make up a nucleotide??

Answers

Answer:

the correct answer is B

Explanation:

The culture you are working has a doubling time of 2 hours and a cell density of 3 x 10^6 cells per mL. For your experiment, you first dilute the culture 100 fold. Assuming that there is no lab phase and that the cells remain in exponential growth the entire time, what is the cell density (cells/mL) after 10 hours

Answers

The cell density (cells/mL) = 15× 10^6 cells per mL.

Calculation of cell density

The doubling time of culture = 2 hours

The cell density after 2 hours = 3 x 10^6 cells per mL

Since the dilution did not affect the lag phase and exponential growth rate, the cell density after 10 hours is calculated below:

2 hour = 3 x 10^6 cells per mL

10 hours = X

Cross multiply,

[tex]x = \frac{10 \times 3 \times10 {}^{6} }{2} [/tex]

[tex]x = \frac{30 \times 10 {}^{6} }{2} [/tex]

X= 15× 10^6 cells per mL

Therefore, the cell density in (cells/mL) after 10 hours = 15× 10^6 cells per mL.

Learn more about cell density here:

https://brainly.com/question/25761557

Label the important points in concave and convex lens


Need help

There have a choices

Vertical axis,focal point, focal length,Curvature,Optical center,Principal axis

Answers

First is vertical axis second is optical centre third is focal point fourth is curvature fifth is focal length and sixth is principal axis

A cell or group of nerve endings which receive stimulus and transmits the impulse to the spine or brain is called the effector.

True or false

Answers

Answer:

True

Explanation:

Effector is an organ or cell that acts in response to a stimulus.

please help!!
…………………….

Answers

Answer:

I think it is  b but where is the map?

Explanation:

Impact of lymphatic disorder​

Answers

Answer:

The lymphatic system clears away infection and keeps your body fluids in balance. If it's not working properly, fluid builds in your tissues and causes swelling, called lymphedema. Other lymphatic system problems can include infections, blockage, and cancer.

Explanation:

II found this on the internet cause i don't really know. Hope it helps

The lymphatic system clears away infection and keeps your body fluids in balance. If it's not working properly, fluid builds in your tissues and causes swelling, called lymphedema. Other lymphatic system problems can include infections, blockage, and cancer.

Answer soon as possible would be appreciated!!!!

The events taking place in two different locations are described below:

Location A: Movement of plates causes hot spots to move to a location with thinner crust
Location B: Tectonic plates move away from each other under the sea

In which location will active volcanoes most likely be formed and why?

Location A, because the magma breaks through the thin crust
Location A, because cracks between plates are filled with molten rocks which solidify
Location B, because the oceanic plate and continental plate are pushed up through the crust
Location B, because the thinner oceanic plate will be pushed under the continental plate

Answers

Answer:

Location B, because the oceanic plate and continental plate are pushed up through the crust

Explanation: hope it helps

Answer:

Location B, because the oceanic plate and continental plate are pushed up through the crust

Explanation:

I took the test and got it right

Does a plant cell undergo cytokinesis?

Answers

Answer:

Plant cells have walls, so cytokinesis cannot proceed with a cleavage furrow. Instead, during telophase a cell plate forms across the cell in the location of the old metaphase plate.

True or False: A DNA strand that has the sequence of TACGTT would have a 1 point
complimentary strand "ATCGAT" *
True
False

Answers

Answer: false

Explanation: the correct complementary strand would be ATGCAA

Other Questions
If you only have a 1 3 cup measuring cup and a recipe calls for 5 1 3 cups of flour, how many 1/3 cups would you need to use? what is international equality The text argues that Uncle Toms Cabin was one of the most important books in American history. What reasons does the text give to support the argument?please help this is due very soon! Us troops dropped herbicides on the vietnamese countryside in order to. Which equation models the rational function shown in the graph? A class has 7 boys and 10 girls. Select all associated ratios for this class.10:37:317:57:1710:710:177:103:7 Quadrilaterals are formed on the side of a fishing tackle box by the adjustable shelves and connecting pieces. Explain why the shelves are always parallel to each other no matter what their position is. help me out on this piecewise function what is 56/30 in its simplest form? 1. How does cancer harm the body? What changes in cells allow cancer to develop? What was the goal of the abolition movement hey im having trouble understanding 40 divided by 8? could you help me out haha The Triple Alliance and Triple Entente were formed through the signing of ? Jeremy and his cousin Brad were about the same age and grew up together. Last week,Brad was killed in a car crash. Jeremy is feeling sad, alone, guilty and angry. What are atleast 3 specific things Jeremy could do to cope with his grief in a healthy way? Find ALL solutions for the photo given. Find all real solutions of the equation given Which of the following is an example of inventory at a company? A. A scooter that has been purchased at a store by a customer B. An employee who provides technical expertise C. Fancy dishes and silverware used at a restaurant D. A list of products that a hardware store wants to order. what did voltaire do before they were famous While shopping at the mall, Tom bought 3 hats and 4 pairs of glasses and spent $123. His friend Jerry bought the same type of items consisting of 1 hat and 3 pairs of glasses and spent $66. How much does a pair of glasses cost? How much does a hat cost? PLEASE PLEASE HELP ME WITH THIS If a spaceship weighs 2500kg and is traveling at the speed of light, how much energy does the ship have?