a substrate binds to an enzyme at the active site, where the reaction occurs.
i believe the answer is 300. ;)
For the first question, I would say a line graph. And the one about the human heart, I need some more information.
Photosynthesis puts oxygen in the atmosphere.
<span><span>Chaetognaths worms </span>are the transparent worms that prey on the other plankton.
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