Final answer:
In biology, hormones that show additivity do not always show synergism as well.
Step-by-step explanation:
In biology, hormones that show additivity do not always show synergism as well. Additivity refers to the combined effect of two or more hormones being equal to the sum of their individual effects. Synergism, on the other hand, occurs when two or more hormones work together to produce a greater effect than the sum of their individual effects. While some hormones may exhibit both additivity and synergism, it is not always the case. For example, two hormones may have additive effects without producing synergism.