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Advocard [28]
3 years ago
13

Which two events occur when gravity causes a nebula to collapse into itself?

Biology
1 answer:
blsea [12.9K]3 years ago
3 0

The two events that occur  when gravity causes a nebula to collapse into itself are:

A. Nuclear fusion start.

B. A new star forms.

Explanation:

  • Nebula are giant clouds of dust and gases.
  • These clouds are considered as progenitors of stars and planets.
  • The gravitational pull within these giant clouds result these large masses to collapse towards their centre.
  • The gravitational collapse results in tremendous rise in temperature till a point where nuclear fusion begin .
  • The stars are born out of such mechanism and act as a source of heat and light in universe.
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Answer:

Environmental awareness is an incredibly important part of our lives. In order to protect the sustainability of the planet, everyone needs to commit to becoming more environmentally aware. Environmental degradation is detrimental and is jeopardising the long-term health and security of animals, plants and humans.

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Which removes carbon dioxide from the atmosphere acting as a carbon sink
kirill115 [55]

Photosynthesis................

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The body uses two types of amino acids: essential and nonessential. Which of the following statements about essential and noness
zlopas [31]

Answer:There are 11 nonessential amino acids.

Explanation:amino acids are monomers of proteins.proteins are made up of carbon,hydrogen, oxygen and nitrogen.there are 20 amino acids found in proteins.

Plants cam produce all the amino acids they need but animals cannot.

Essential amino acids are those that animals cannot produce by themselves and so need to obtain from their diet.there are 9 in numbers.

Non-essential amino acids are produced by the animals.they are not necessarily non-essential as the name indicates.they are 11 in numbers.

7 0
3 years ago
In the ED, blood is withdrawn from the vein and into a test tube. The packed cell volume (RBCs) is 1.45 ml, and the plasma volum
Yuri [45]

Answer:

<h2>1.45 + 3.55 = 5.0 (total blood volume);  1.45/5.0 × 100 = 29% (low),</h2>

Explanation:

HCT is calculated as:

HCT = Volume of red blood cells / (Volume of red blood cells + volume of plasma) x 100  

1.45 + 3.55 = 5.0 (total blood volume);  1.45/5.0 × 100 = 29% (low), normal range for an adult female HCT  ranges from 38 to 46% (some sources claim 34.9-44.5%).

*for calculating this, one must know two of these three values: packed cell volume, total blood volume, plasma volume.

Total blood volume = Packed cell volume + plasma volume.

4 0
3 years ago
Which of the following statements is NOT true regarding ATP production in muscles during periods of prolonged energy use, such a
Marysya12 [62]

Answer:

C.In the absence of oxygen, creatine phosphate can drive aerobic respiration pathways for a few minutes.

Explanation:

C. In the absence of oxygen, creatine phosphate can drive aerobic respiration pathways for a few minutes.

This statement  not true for a following reasons.

Firstly,  creatine phosphate directly phosphorylates ATP instead of providing any support for aerobic pathways.

Secondly, creatine phosphate stores are used up in about 15 seconds only. Thirdly, a cell does not need  oxygen deficit for creatine phosphate to be activated, it just needs to be short on ATP.

4 0
3 years ago
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