Answer:
geologists use rock samples and direct evidence to prove what earth's structure is like.
Explanation:
Answer: This is because animals (like humans) have more organelles to store in our bodies than bacteria. This makes sense because without all of our organelles we wouldn't be able to function properly. This is just another one of those form=function things.
-AnaMae10
The two categories would be Biotic and Abiotic
