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External Regulators<span>. </span>External regulators<span> are also </span>proteins<span>, but they react to stimuli from outside the cell. They direct cells to either speed or slow the cell cycle based upon outside conditions. For example, one </span>protein<span> reacts to molecules on the outside of a neighboring cell.
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Answer:
Humans are gradually altering the climate and the earth's temperature through burning fossil fuels, destroying forests, and rearing animals.
Explanation:
This significantly increases the amount of greenhouse gases already present in the atmosphere, increasing the greenhouse effect and contributing to global warming.
Climate change is mostly caused by the greenhouse effect. Some gases in the Earth's atmosphere act as greenhouse glass, trapping heat from the sun and preventing it from escaping into space, causing global warming.
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Most galaxies have billions of stars.
Answer:
Question 4.
1. is sea floor spreading
2 is volcano
3. is subduction
Question 3.
1. is mountain building
2. is plate tectonics
3. is ocean basin
Explanation:
this is 8th grade science and im in 10th. its easy