Question

refer to the table. during the laboratory investigation of the effects of heat on corals, four coral samples were exposed to conditions according to the scheme shown.

	coral from cool pools	coral from warm pools
exposed to hot temperatures	ib	iib

which samples represent controls in this experiment?
samples labeled with an \i\
samples labeled with an \ii\
samples labeled with an \a\
samples labeled with a \b\

Explanation:

In an experiment, control samples are exposed to normal or baseline conditions. Here, samples exposed to safe temperatures (labeled 'A') serve as controls as they are not subjected to the experimental variable (hot temperatures).

Answer:

C. Samples labeled with an "A"