Final answer:
Boa constrictors on an island are an example of a population, which is all the individuals of the same species living in a specific area.
Step-by-step explanation:
Boa constrictors on an island represent a population. A population is defined as all the individuals of the same species living in a particular geographic area. These individuals share the same environment and can potentially interbreed. For example, if an island has a group of boa constrictors, this group would constitute the boa constrictor population of that island. The term 'organism' refers to individual living things.
While 'ecosystem' consists of all living and nonliving components in a certain area, an 'organ' is a part of an organism that performs a specific function. Considering the given context, when referencing a group of boa constrictors on an island, we are referring to their collective presence as a population rather than the individual boa constrictors (organisms), their body parts (organs), or the interactive system they are part of (ecosystem).