Final answer:
The prefixes 'hyper-' and 'hypo-' are opposites, with 'hyper-' indicating an excess or above normal and 'hypo-' indicating below normal or a deficiency.
Step-by-step explanation:
The two prefixes that are opposites are hyper- and hypo-. These prefixes are commonly used in various disciplines, including science and medicine, to indicate levels relative to a standard or norm. The prefix hyper- means 'over' or 'above' and is used to describe something in excess or above normal, such as in 'hyperactive' which means excessively active. Conversely, the prefix hypo- means 'under' or 'below' and is used for things that are below normal, such as 'hypothermia' which refers to an abnormally low body temperature. By understanding the meanings of these prefixes, we can infer that the terms they are attached to denote either an increase or decrease relative to a normal condition or state.