Which of the following "spheres" is not involved in the water cycle?
a biosphere
b exosphere
c atmosphere
d hydrosphere

There are six elements that make up most of the human body. which of the following is not one of these six elements?

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.

Will someone me with this.. specialized cells which perform a particular function form: tissues organs or organism