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kvv77 [185]
3 years ago
15

Part 1: Describe the mass and surface temperature of the main sequence stars.

Biology
1 answer:
andrew-mc [135]3 years ago
6 0

Answer:

Main sequence is when a star is burning hydrogen in its core. The luminosity and temperature of a main-sequence star are set by its mass. More massive means brighter and hotter. A ten solar mass star has about ten times the sun's supply of nuclear energy.

The main sequence stretching from the upper left (hot, luminous stars) to the bottom right (cool, faint stars) dominates the HR diagram. It is here that stars spend about 90% of their lives burning hydrogen into helium in their cores.

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Answer:

Which of the following is not a type of endocytosis?

constitutive secretion

Explanation:

There are only three types of endocytosis namely;  phagocytosis, pinocytosis and receptor-mediated endocytosis

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3 years ago
The first protists probably appeared around a. 1.5 million years ago b. 170 million years ago c. 1.5 billion years ago d. 5 bill
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Answer:

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Explanation:

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Endosymbiosis is how modern eukaryotes evolved from ancient prokaryotes.<br> O True<br> False
pashok25 [27]

Answer:

true

Explanation:

8 0
3 years ago
11. Why<br> are<br> organisms with more similar amino acid sequences more closely related?
jok3333 [9.3K]

Answer and Explanation:

Because the DNA sequence determines a protein's amino acid sequence, a gene shared by two closely related organisms should have similar, or even identical, amino acid sequences. That's because closely related species most likely diverged from one another fairly recently in the evolutionary span. Thus, they haven't had as much time to accumulate random mutations in their genetic codes.

7 0
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3.Why should a model of the carbon cycle include the burning of fossil fuels?(1 point)
user100 [1]

Answer:

Burning fossil fuels moves carbon from the geosphere to the atmosphere.

Explanation:

  • Fossil fuels such as coal, petroleum and natural gas are produced and stored in the geosphere. i.e. the part of the Earth that includes the Earth's interior, landforms, rocks and minerals.
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3 years ago
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