It could be the optimum temperature the enzymes inside the plant work best in. But, I am not really sure......
When our body temperature rises we sweat to cool us down to the normal body temperature
I believe it would also be noting the color of a solution when heated.
Answer: D
Explanation: All of the Above
Because natural selection acts directly only on phenotypes, more genetic variation within a population usually enables more phenotypic variation. Some new alleles increase an organism's ability to survive and reproduce, which then ensures the survival of the allele in the population.