Sally and maria hypothesized that earthworms lived only in dark, damp places. they measured a one-meter square in a shady spot near a stream. they dug through the soil and collected earthworms. they collected 43 worms. they repeated the experiment in several locations, sunny and dry included. they found the most worms in the shady, damp plot near the stream. several other groups of science students carried out the same experiment and got similar results. this is an example of
a) bias.
b) repetition.
c) replication.
d) validity.

Because other scientists did the experiment and got the same results it's replication. the other group replicated the experiment and we're able to replicate the results

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.