2. brittany wanted to find out which wheels were best for her skateboard. she purchased 4 sets of new
wheels of different brands. she and a friend set up a course on her driveway. brittany rode through
the course 5 times on each set of wheels. her friend timed her with a stopwatch and recorded the
times. they averaged the times for each brand of wheels.
a. independent variable
b. dependent variable -
c. experimental group -
d. control group -
e. constants -

Atp is is our little "pocket" of energy. of course, if you have too little, then it means you have too little energy, and you'll pass out. the way to not have enough, is to have no energy sources (glucose, fats, proteins). you can't have too many atp molecules. cycles like the krebs cycle produce it, but if you have too much of any substrate (or too little for that matter), the cycle stops and atp is no longer made (it stops until substrate levels are such that the process can go on). in any case, this is unlikely since atp is constantly hydrolyzed and remade, even while you're asleep. you won't have too much. if you have zero, you are dead or dying.