This law states that in an undisturbed rock sequenceThe oldest layers are on the bottom and each successive layer is younger than the one underneath it

What are chlorofluorocarbons made of

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.

What is the main fuel source for the work of the cell