Kevin is studying predator-prey interactions. one day he notices a spider eating a cricket caught in its web. later that day, a bird eats the spider. how many populations are involved in his study?

3.

Explanation:

A population refers to the total number of organisms of the same species, that inhabit a distinct area at the same time, and have the capacity of interbreeding. In Kevin´s study, we have three different populations involved: spiders, crickets, and birds. Kevin is probably developing a study on population biology, focusing on the group dynamics between populations.

the question deals with financial planning and the answer is that dan did not stay on budget due to the fact that this guy needs to start decreasing his discretionary spending. according to the financial plan, he needed to balance his expenses and resources.