Question

biologists are studying tropical plants to determine how far north each type of plant can survive. what is the population?
biologists
tropical plants
biologists participating in the research
the tropical plants that were moved farther north

Explanation:

In a study, the population is the entire group of interest. Here, biologists are studying tropical plants, so the population is all tropical plants. The biologists are the researchers, and the subset of tropical plants that are moved north is a sample.

Answer:

B. tropical plants