Is there any species that went extinct in recent years due to natural causes (not caused by human interaction). if so, what caused it?

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.

All phases of matter may have a fixed mass