Step-by-step explanation:
A population is a group of organisms of the same species, living in the same area and interacting with each other. Because they live together in one area, members of the same species breed with each other. Now, many different species live together in an ecosystem. All populations form a community. For example, there are populations living together on grasslands. Unless there is a considerable physical barrier, it is rare for communities to be completely isolated.
We can conclude that the correct answer is:
Answer:
Rarely