In the human body, the nervous system is responsible for activating the body for such things as the fight-or-flight response, while the nervous system is responsible for calming and slowing down the body. a. autonomic; somatic b. sympathetic; parasympathetic c. parasympathetic; sympathetic d. somatic; autonomic

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.

The energy required to vaporize a certain amount of a substance is greater than the amount of energy necessary to raise the temperature of the same amout of that substance by 1 degreee celcius

What are the student's observations and inferences before he starts his investigation?