WILL MARK BRAINLIEST!

The classification system for organisms has changed from seven levels to eight. This happened because

A. scientific consensus changed as scientists learned more about organisms.
B. scientists did not test the seven-level system often enough to lead to consensus.
C. the eight-level system of classification is an emerging idea that needs more testing.
D. the seven-level system of classification was not supported by scientists.

What are the four basic classes of organic molecules how do they differ structurally and functionally

Animal bodies (and even plant bodies for that matter) are complex enough that life couldn't exist without enzymes. enzymes are usually large, complex biological catalysts that are expensive to make. enzymes speed up the rate of chemical reactions without being used up during the reaction (they can be reused many times). they are highly specific in the reactions they regulate. knowing what enzymes are and how they function, why does this explain why complex life forms could not exist if there were no enzymes.

2. sketch the inside of the bean nodule, and describe or label what you observed with the hand lens.