Wood, Bricks, Cement, and Glass
Answer: A.prey
Explanation:
The prey is the resource for which the two different flea species in the same forest would likely to compete with each other. This is because of the fact that prey is the source of food which is the basic need required for the survival of both the flea species. Other needs like mates, space and hosts are secondary needs, the two flea species would probably survive without them. If the prey population is small then the competition among the members of the two different flea species will increase.
Well, some theories are stupid and some are valid. First, scientists believe that we (humans) evolved from apes. I don't think that is valid, they have no proof. But I do believe that over time, animals have evolved from ancestors. Say birds didn't have wings, Over time God (or whatever you believe) gave them wings so it would help them. Some of those theories are that what influenced scientific debate.