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Answer:

Advanced forms of life existed on earth at least 3.55 billion years ago. In rocks of that age, fossilized imprints have been found of bacteria that look uncannily like cyanobacteria, the most highly evolved photosynthetic organisms present in the world today. Carbon deposits enriched in the lighter carbon-12 isotope over the heavier carbon-13 isotope-a sign of biological carbon assimilation-attest to an even older age. On the other hand, it is believed that our young planet, still in the throes of volcanic eruptions and battered by falling comets and asteroids, remained inhospitable to life for about half a billion years after its birth, together with the rest of the solar system, some 4.55 billion years ago. This leaves a window of perhaps 200-300 million years for the appearance of life on earth.

divine interventionThis duration was once considered too short for the emergence of something as complex as a living cell. Hence suggestions were made that germs of life may have come to earth from outer space with cometary dust or even, as proposed by Francis Crick of DNA double-helix fame, on a spaceship sent out by some distant civilization. No evidence in support of these proposals has yet been obtained. Meanwhile the reason for making them has largely disappeared. It is now generally agreed that if life arose spontaneously by natural processes-a necessary assumption if we wish to remain within the realm of science-it must have arisen fairly quickly, more in a matter of millennia or centuries, perhaps even less, than in millions of years. Even if life came from elsewhere, we would still have to account for its first development. Thus we might as well assume that life started on earth.

How this momentous event happened is still highly conjectural, though no longer purely speculative. The clues come from the earth, from outer space, from laboratory experiments, and, especially, from life itself. The history of life on earth is written in the cells and molecules of existing organisms. Thanks to the advances of cell biology, biochemistry and molecular biology, scientists are becoming increasingly adept at reading the text.

An important rule in this exercise is to reconstruct the earliest events in life's history without assuming they proceeded with the benefit of foresight. Every step must be accounted for in terms of antecedent and concomitant events. Each must stand on its own and cannot be viewed as a preparation for things to come. Any hint of teleology must be avoided.

Answer: Ari draw a food web.

Explanation:

A single ecosystem which contains all the food chains is called a food web.

In a food web each living thing present in a food web is a part of multiple food chains. Hence, food webs tend to represent the overlapping of food chains in that ecosystem.

The flow chart drawn by Ari represents that the living things present in cycle 1 are part of cycle 2 and cycle 3. Also, living things present in cycle 2 are part of cycle 1 and cycle 3.

A food chain is basically a single path where each organism is dependent of the other as a source of food without any overlapping.

Thus, we can conclude that Ari draw a food web.

Answer:

c

Explanation:

Answer:

Every body on earth attracts every other body. with a force. which is directly proportional to product of their masses and inversely proportional to square of distance between them.

Answer:

countries with higher populations are likely to use more resources

Explanation:

The vastness of the threats to the ecosystem is directly linked to human population size and resource uses per person. Resource use, waste production and environmental degradation are accelerated by population growth.

The relationship between human population size and resource is that Countries with high populations are likely to use more resources.

Population size is refers to the total number of people that are living together in a place or people occupying a territory, state, town or country. The higher the population size, the higher the number of resources that will be needed and use.

Therefore, The relationship between human population size and resource is that Countries with high populations are likely to use more resources.

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Answer:

anaerobic heterotrophic bacteria

Explanation:

Cyanobacteria, also known as blue-green algae, started out on Earth quite a while ago. Possible fossil examples have been found in rocks that are around 3500 million years old, in Western Australia. and make me brainlist

Answer:

from view,I will go with yes because it depends on the food he eats whether it is balanced or not. for example,if he eats only vitamin foods and carbohydrates there won't be enough energy for him go pass the day.

Yes, there is probably a link between your brother's dietary habits and his fatigue level.

Football practice can be a physically taxing and energy-intensive activity. Your brother may feel tired and struggle to maintain energy levels if he is not getting enough nutrition to support his increased energy expenditure. When creating a healthy diet plan for your sibling it is important to focus on providing adequate nutrition to support your sibling's athletic performance and recovery. Here is a dietary recommendation:

Encourage your sibling to prioritize nutrient-dense foods that offer a balanced balance of carbohydrates, proteins and fats, and to eat frequent meals, especially breakfast.

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Answer:

allopolyploidy

Explanation:

Polyploidy is the condition by which a cell might have more than two chromosome sets that form homologous pairs. It might occur due to a failure or abnormality in cell division.  

Autopolyploidy

Refer to a type of polyploidy in which an organism has more than two copies of homologous chromosomes. It results from the duplication of a group of chromosomes of the same species. Autopolyploid individuals have at least three groups of homologous chromosomes. Autopolyploidy is produced by the gamete fusion of the same progenitor - same species-, duplicating the number of chromosomes of diploid species. The autopolyploid cell has groups of homologous chromosomes. Autopolyploidy is produced mainly due to non-disjunction during meiosis.

Allopolyploidy

Refer to another type of polyploidy in which species have more than three sets of chromosomes in their cells. Allopolyploidy occurs when two different species mate, leading to the fusion of gametes that belong to different species and produce a new hybrid. The chromosomic complement has more than two copies of chromosomes. The hybrid is infertile with the parental species. The allopolyploid cells have chromosome groups that are not homologous.  

In the exposed example two different species mate and produce a hybrid species.

Answer:

○They are located in the retina.

The type of cell in your eye that

 detects photons and sends them to 

your brain. 

They are found in the retina (the back layer of the eye). Rods and cones are 

the two types.

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Answer:

In the water cycle, evaporation occurs when sunlight warms the surface of the water. The heat from the sun makes the water molecules move faster and faster, until they move so fast they escape as a gas. ... When it is cool enough, the water vapor condenses and returns to liquid water.

Answer:

Explanation:

1) The mitochondrion : is an organelle that makes energy available to the cell. They use energy from organic compounds (such as glucose) to make molecules of ATP (adenosine triphosphate).

2) Ribosomes: are small structures where proteins are made. Both subunits consist of proteins and RNA. RNA from the nucleus carries the genetic code, copied from DNA, which remains in the nucleus. At the ribosome, the genetic code in RNA is used to assemble and join together amino acids to make proteins. Ribosomes can be found alone or in groups within the cytoplasm, as well as on the RER.

3) Cytoskeleton: is the “frame” of the cell, keeping structures in place, providing support, and giving the cell a definite shape.The cytoskeleton organizes the cell and keeps the cell’s organelles in place, but it also aids in the movement of organelles throughout the cell.

Explanation:

It's the most important factor when buying real estate. Location matters, even the location inside the neighborhood will have a large impact on your home's value. ... You want to buy on the low end of the neighborhood's price range because the other homes in your neighborhood will bring your value up

Answer:

c. A at the top of the saturated zone.

Answer: nucleolus: a small dense spherical structure in the nucleus of a cell during interphase. nucleus: the positively charged central core of an atom, consisting of protons and neutrons and containing nearly all its mass. ribosome: a minute particle consisting of RNA and associated proteins found in large numbers in the cytoplasm of living cells. They bind messenger RNA and transfer RNA to synthesize polypeptides and proteins. vesicle: a small fluid-filled bladder, sac, cyst, or vacuole within the body. rough endoplasmic: reticulum (RER), series of connected flattened sacs, part of a continuous membrane organelle within the cytoplasm of eukaryotic cells, that plays a central role in the synthesis of proteins. Golgi apparatus: a complex of vesicles and folded membranes within the cytoplasm of most eukaryotic cells, involved in secretion and intracellular transport.

Explanation:

Answer:

I think it's probably 2,3, and 4 :))

Answer:

renewable resources can be replenished.

most renewable resources are easily available in nature.

all renewable resources are cost effective.

Answer:

- Typically begins about 20 minutes after stage 1: Stage 3

- Alpha waves dominate: Stage 1

- Sleep spindles occur: Stage 2

- Light sleep: Stage 2

- Vital signs are at their lowest levels: Stage 4

- Delta waves dominate: Stage 4

- Feeling a drifting sensation: Stage 1

- Beginning of decline in respiration and blood pressure: Stage 2  

Explanation:

Sleep can be divided into two phases: 1-non-rapid eye movement (NREM) sleep and 2-rapid eye movement (REM) sleep. In turn, NREM sleep is divided into four stages (1 to 4). Stages 1-2 are referred to as “light sleep”, while stages 3-4 are known as “deep sleep”. The first NREM stage (normal length: 5-10 minutes) is the transition between wakefulness and sleep. During this stage, the brain produces high amplitude theta waves. During the second NREM stage (light sleep, 10-25 minutes), the body temperature drops, muscles are in a more relaxed state, the breathing and heart rate also drop. The third NREM stage (20-40 minutes) involves the emergence of delta waves and muscles are entirely relaxed. This period (stage 3) is a period of deep sleep, which is referred to as slow-wave sleep (SWS). Finally, the fourth NREM stage (10-60 minutes) is characterized by high amplitude delta waves, while heart and respiration rates slow dramatically.

Explanation:

Risks:

may lead to a lack of variety in plant or animal species

The nutritional value of foods can be less

Benefits:

faster than natural selection

More selective breeds / Types

Answer:

d. all of the above

Explanation:

tigers and zebras both have activities that they're limited to by each species. But both of them do all that was listed, and running, breathing and digesting all take the body's energy to do.

Answer:

D

Explanation:

they both need the energy to do that

Answer:

The sharing of common ancestors

Answer:

to be considered a species, a population must be reproductively isolated from other species

Answer:

liquids are hydrophobic

A

Answer:

a

Explanation:

Data are fundamental in Life/Natural Science because they can help us to answer hypotheses.​

A hypothesis is a given explanation about a phenomenon observed from a question from the real world.

In conclusion, data are fundamental in Life/Natural Science because they can help us to answer hypotheses.​

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Answer:

It effects the way that certain traits in a species evolve in an area due to being better for dealing with the environment more effectively.

Explanation:

This is legit how nature works. Please rate 5 stars.

Answer:

carbon dioxide is more soluble in water than oxygen and hence is mostly transported in the dissolved form in our blood.

Carbon dioxide can be transported through the blood via three methods. It is dissolved directly in the blood, bound to plasma proteins or hemoglobin, or converted into bicarbonate.

The majority of carbon dioxide is transported as part of the bicarbonate system.

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Answer:

<1=105 <2=75

Explanation:

So 2 is 75 degrees because it's corrosponding with <6.

75+<1=180

-75       -75

<1=105

Answer:

sharks cannot eat animals ..... shark can eat mamals and fishes

Explanation:

Answer:

Because melting can be reversed ( freezing )

Explanation:

Physical change is a change that can be reversed

Answer:

we need the picture

Explanation: