When a scientific experiment is carried out in a controlled setting, all variables are kept the same except for the C. experimental. Experimental variables are the things you are studying in the experiment and it is the only variable you can change.
To keep the body's internal environment in balance c) to make room for nutrients coming in d) to reduce unpleasant
<span>The claim also known as the explanation, the evidence/the observations, and the reasoning. (Reasoning that explains the evidence and why it supports the claim.)</span>
Catalyst maybe ( lower activation energy).
It could be c. But the answer is B
