1. an atom
2. compound
3. both
4. atom
Heat from the earths core causes movement in the mantle, which results in movement on the crust.
Endocrine system is the answer
Answer:
The atmosphere protects earth from the suns strong rays and keeps our oxygen on earth for us to breathe. Not to mention the moon would start taking all our water. If we somehow DID survive, we would not last very long, for the earth would over heat and with no plants, animals, or water, we would either die from starvation or from dehydration. If it weren't for the atmosphere our world would be burned to a crisp like Venus!
Explanation:
It is a metabolic process that is one of the main parts of cellular respiration
