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mylen [45]
2 years ago
6

Select the star life cycle that is most accurate

Biology
1 answer:
Komok [63]2 years ago
6 0

The correct answer is A. Nebula, star of seven stellar masses, a red supergiant, supernova, black hole.

Explanation

Stars have a life cycle that begins with the gravitational collapse of a gaseous nebula. Subsequently, thermonuclear fusion occurs that allows the conversion of hydrogen into helium, this causes the released energy to pass through the star and radiate in a phase called the star of seven stellar masses. After several billion years, the star passes to the "red giant" stage. Here the star contracts and raises its temperature. After this, the stars (which have masses greater than the sun) detach from their layers forming supernovae, and later, these give rise to "black holes". According to the above, the correct answer is A. Nebula, star of seven stellar masses, a red supergiant, supernova, black hole.

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A cellular structure that can be found in each type of cell that is unique to each type of cell, but that has a similar function
34kurt

Answer

Complex barrier to the flow of substances out of the cells,and restrictions to inflow of unwanted substances into the cells. The hydrophobic and hydrophilic nature of the cell membrane controls the entry of substances from the extracellular medium into the intracellualr. In addition the polarity restricts certain substance movement across the walls.

Serve as the selective channels  for the  influx of certain substances into the cells, and the out flux of wastes.This is through ion channels for the movements of ions across.

Provide insulation to the cells,to maintain the constant internal temperature,this is through the presence of lipids as( Phospholipids and cholesterol).The latter prevent the clogging of the lipids in the cell membrane therefore preventing frozen up of the cell membrane,providing insulation.

Separation of metabolic process in the cell.

Explanation:

Cell membrane-This is present in all cells.But the variation of its constituents makes it unique to each cell. Although it performs the same role, the location and role the cells it bounded, reflects its  constituents, it is made up of lipids, carbohydrate, protein and cholesterol

6 0
3 years ago
How are organisms grouped?<br> A. By genus<br> B. By family<br> C. By species
goldenfox [79]

Answer:

The answer is option C.

By species

Hope this helps you

7 0
3 years ago
Explain how Charles Darwin’s theory of natural selection would account for evolution of populations. Use the following terms in
vovikov84 [41]

Explanation:

charles darwin proposed thoery of natural selection.he had collected imnumerable specimens of plant and animals.he published concept survival of fittest. while explaining he says that There is always competition for food.only those organism survive which shows adptations in various reasons. it thoery of natural selection.

There are some objections,

1. natural selection is not only factor responsible for evolution.

2. darwin did not mention uesful and useless modifications.

3. There is no explanation about slow and abrupt changes

6 0
3 years ago
Which of the following is NOT a function of the stem of a plant?
stealth61 [152]

Answer:

Absorption of water from soil

Explanation:

That's what the roots do :)

6 0
2 years ago
During photosynthesis which product is formed that cannot be broken into smaller units?
OleMash [197]

Answer:

I believe it is cellulose, I'm not a 100% sure

3 0
3 years ago
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