1. A new species of multicellular, eukaryotic heterotrophs is discovered. This species secretes digestive enzymes to digest its food externally. Which taxa would this organism belong to?

A.
domain Archaea

B.
phylum Platyhelminthes

C.
kingdom Fungi

D.
kingdom Animalia

2. Mammals and reptiles both belong to the amniote clade. What is the evolutionary significance of this clade?

A.
Amniotes produce membranes that allow them to reproduce without laying eggs in water.

B.
Amniotes produce milk to feed their offspring.

C.
Amniotes were the first vertebrates to evolve limbs specialized for living on land.

D.
Amniotes were the first vertebrates to evolve jaws for digesting the tough food found on land.

3. Which of the following is an example of negative feedback leading to homeostasis?

A.
a sponge conforming its internal salt concentration to match the salinity of its environment

B.
a frog slowing its metabolic rate while hibernating over the winter

C.
a cat’s uterine contractions increasing in strength as it gives birth to a litter of kittens

D.
a human sweating to reduce his or her body temperature on a hot day

Answer:

A sugar called deoxyribose.

Explanation:

DNA is made up of molecules called "nucleotides". These are:

Thus the first option is the right answer.

Reasons why the other options are wrong:

"A plasma called haemoglobin" is wrong as plasma and haemoglobin are related to the blood.

"A chemical called nucleic acid" is wrong as it is not what DNA's made up of. DNA and RNA are nucleic acids themselves.

"An acid called chlorophyll" is wrong as chlorophyll is related to plants.

Answer:

Molecules with bigger charge or size can not pass through every membrane but other molecules can.

1. bigger size

2. bigger charge

3. electronegativity

Explanation:

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Answer:

because the suns mass creates a gravitational force that pulls the earth towards it

Answer: Impulses

Explanation: Impulses are brought together creating sensations either adding to memory or helping produce thought that translate sensations into perceptions

The genetic variation occurs due to induced changes to the genome from environmental factors, fertilization of two haploid gametes during gamete fusion. The correct options are D and E.

The presence of differences in gene sequences between individual organisms of a species is referred to as genetic variation. It allows for natural selection, which is one of the primary forces driving life's evolution.

The genetic variation occurs due to induced changes to the genome from environmental factors, fertilization of two haploid gametes during gamete fusion.

Thus, the correct options are D and E.

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Answer

a,d, and e

Explanation:

i did it

Yes, it is possible because making a paper fold takes far less time than making a thermal or plastic item. The gravitational force is the reason behind this.

Polystyrene, a complicated substance, is used to make thermocol. When heated to over 100°C, it changes to a liquid condition and then returns to a solid state when cooled.

A gravitational force is defined as which draws particles or bodies together.

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Answer:

enzymes don't affect the free energy of the reactants or products

Explanation:

That is, they don't change whether a reaction is energy-releasing or energy-absorbing overall. That's because enzymes don't affect the free energy of the reactants or products. Instead, enzymes lower the energy of the transition state, an unstable state that products must pass through in order to become reactants.

Viruses are organisms that share traits with both living and non-living organisms. The virus' genetic material is made up of both DNA and RNA.

A virus is an infectious microorganism made up of a nucleic acid segment (DNA or RNA) encased in a protein coat. A virus cannot multiply on its own; instead, it must infect cells and make copies of itself using the host cell's components. A virus frequently kills the host cell in the process, resulting in harm to the host organism.

Viruses have the following characteristics:

Viruses have an exterior capsule layer and a specified boundary. Only the host cells provide energy to the virus. They thrive and mature, multiplying their numbers solely within the host cells.

Viruses lack the following characteristics:

A virus is a single-celled animal with no more than one cell. In the virus, there is no internal organization. If a virus is present outside of the host environment, it does not grow, develop, or require energy. Viruses do not remove trash.

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The process of mitosis divides DNA equally between two daughter cells, i.e., option B is correct.

Mitosis is a way of dividing cells in which the chromosome number remains the same as in parent cells, this is why it is also referred to as equational division.

Mitosis is the process by which a cell separates its duplicated DNA, eventually separating its nucleus in half.

Thus, the correct option is B.

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The exercise reduces the levels of the low-density lipoproteins or the bad cholesterol. It is found that, the people, who exercise daily have a low level of low-density lipoproteins, and an increased level of high-density lipoprotein, which is also known as good cholesterol.

Scientific hypotheses, in general, are the premises within a given theory, which can be validated on the basis of a scientific method, contributing to the formulation of new hypotheses. In this experiment the theory says that cholesterol levels between people who exercise and people who do not exercise is different. Within this theory, the statement says that people who exercise for an hour may have lower cholesterol levels, is a hypothesis that will be confirmed or refuted after the experiment.

The dependent variable is summarized in the phenomena or factors explained or identified, because they are influenced or determined by the independent variable. In this experiment the independent variable is the performance (or not) of exercises. Exercise is what influences or determines cholesterol levels in this study. Thus, cholesterol levels are a dependent variable.

Hence, to check whether a person exercises regularly or not, the scientist can determine the cholesterol level.

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The average force vehicle experiences is 6000N.  The correct option is B.

It states that the force F is directly proportional to the acceleration a of the body and its mass.

F =ma

Given is a 2000kg vehicle travelling 30m/s takes 10s.

It takes t = 10s to come to rest, then the acceleration will be

a = velocity /time

a = 30/(10)

a = 3 m/s²

According to the Newton's second law of motion.

F = 2000 kg x 3 m/s²

F =6000 N

Thus, the average force vehicle experiences is 6000N.

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Astronomy is the the study of the space around Earth and within the universe, including meteoroids and galaxies that are trillions of miles away.

Astronomy is the study of everything in the universe beyond Earth's atmosphere.

It is the the study of the space around Earth and within the universe, including meteoroids and galaxies that are trillions of miles away.

In summary, it  includes objects we can see with eyes, like the Sun , the Moon , the planets, and the stars .

It also includes objects we can only see with telescopes or other instruments, like faraway galaxies and tiny particles.

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From the calculations, the rate of growth of the culture is 2.88.

We apply the exponential growth problem when there is an exponential increase.

Thus, we have; P =Poe^rt

P = amount at time t

Po = amount originally present

t = time taken

r = rate of growth

1.6 × 10^6 = 16e^4r

1.6 × 10^6/16 = e^4r

1.0 * 10^5 =  e^4r

ln 1.0 * 10^5 = ln e^4r

11.5 = 4r

r = 11.5/4

r = 2.88

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Answer:

This graph illustrates the change in global surface temperature relative to 1951-1980 average temperatures. Nineteen of the hottest years have occurred since 2000, with the exception of 1998, which was helped by a very strong El Niño. The year 2020 tied with 2016 for the hottest year on record since record-keeping began in 1880 (source: NASA/GISS). This research is broadly consistent with similar constructions prepared by the Climatic Research Unit and the National Oceanic and Atmospheric Administration.

The time series below shows the five-year average variation of global surface temperatures. Dark blue indicates areas cooler than average. Dark red indicates areas warmer than average.

The “Global Temperature” figure on the home page dashboard shows global temperature change since 1880. One gets this number by subtracting the first data point in the chart (-0.16°C) from the latest data point (0.85°C).

The domain incorporates cultural norms that directly impact sustainable development. hence, option B is correct.

The economic sphere is a social one that includes connected human behaviors and exchanges and does not exist in a vacuum. Individuals, companies, organizations, and governments can all act as economic agents.

Cultural norms are incorporated into the economic sector and have a direct effect on sustainable development. The conservation and preservation of both natural and man-made resources are the major objectives of the environmental domain.

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Sunlight is an unseen factor that affects the carrying capacity of the ocean.

Carrying capacity may be defined as the maximum number of individuals that can be supported by a habitat.

The other options under this question are water chemistry, water availability, space, and sunlight.

Water availability and space both are unlimited in the ocean habitat, while the water chemistry remains the same throughout the ocean.

Therefore, sunlight is an unseen factor that affects the carrying capacity of the ocean.

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Answer:

7

Explanation:

Population size of 11

After 3 births

4 deaths

2 immigrations

5 emigrations

11+3-4+2-5=7

The two-argument people might make for not preserving botana curus are they take a long time to grow, so it may not be worth the effort; there are organisms that are similar, and it may be expensive.

Botana curus is a precious plant because it yields Carol, a substance that can be used to treat cancer.

Curol cannot be manufactured in a lab. Botana curus grows slowly and is an endangered species, so its ability to produce large amounts of Curol is limited.

Thus, the two arguments are they take a long time to grow, so it may not be worth the effort and there are organisms that are similar, and it may be expensive.

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Preclinical studies involves the testing of live animals. The correct option is D.

The use of biology to solve problems and the to create valuable goods is referred to as biotechnology. The most common method is genetic engineering, which allows scientists to manipulate an organism's DNA.

Clinical research, a part of biotechnology includes the following phases:

Testing live animals is a part of a preclinical trial that can involve certain vaccination, drug, medication, etc.

Thus, the correct option is D.

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Answer:

Primitive neuroectodermal tumor (PNET)

Explanation:

They usually occur in early childhood but may become symptomatic in adult life. In children, they commonly occur in or near a spinal fluid sac known as the fourth ventricle and are called medulloblastomas.

What happens to the ocean water as it moves from Antarctica to the equator is : ( B ) It becomes less dense and rises to the surface.

The conveyor belt is a system of oceans which transports water and propel deep current of water bodies across the globe based on the differences in water densities.

As the ocean water moves from the Antarctica to the equator the cold ocean water mixes with the warm ocean water at the equator, which makes the water less dense and rises to the surface.

Hence we can conclude that What happens to the ocean water as it moves from Antarctica to the equator is  It becomes less dense and rises to the surface.

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Answer:

Your skin colour is based on millions of years of evolution depending on where your ancestors lived and their living conditions. Skin colour varies on where you live (or came from). Children will have different tones or shades of skin from their parents due to human skin colour having multiple genes. This is an example of polygenic inheritance.

Explanation:

see the picture below to see how different skin colours depend on where they live:

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Answer:

1.producing red and white blood cells

This is done by bone marrow and other organs.

Answer:

1.  Producing red and white blood cells

Explanation:

Blood cells are not part of the nervous system and are not produced by the nervous system.

Rhythm Salsa resulted from the development of a muscle cell culture technique.

To obtain a cell culture, it is necessary to disaggregate the original tissue, which can be by mechanical force or enzymatic process. These cells are grown in an adherent layer in a single layer (monolayer) or in organoid format (3D culture) or in suspension.

With this information we can conclude that rhythm Salsa resulted from the development of a muscle cell culture technique.

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Answer:

yes

Explanation:

The consequences of genetic drift are numerous. It leads to random changes in allele frequencies. Drift causes fixation of alleles through the loss of alleles or genotypes. Drift can lead to the fixation or loss of entire genotypes in clonal (asexual) organisms