Final answer:
The prefixes that mean "within" are 'endo-' and 'in-'. These prefixes are used to denote something inside or within boundaries, such as 'endoskeleton' for an internal skeleton or 'inbound' meaning traveling towards the inside.
Step-by-step explanation:
The prefixes that mean "within" are endo- and in-. The prefix endo- is often used in scientific contexts, such as in biology, to denote something inside or within. For example, endoskeleton refers to an internal skeleton. Similarly, the prefix in- is used in various contexts to indicate within or inside, such as in the word inbound, meaning traveling towards the inside or center. Both prefixes serve to locate something internally or within boundaries. While prefixes like inter- and pre- suggest between or before, respectively, they do not convey the meaning of within.