The interaction between two species in which both species are harmed is known as a. competition. b. predation. c. commensalism. d. parasitism. e. mutualism.

The answer is A. Competition is the contest for limited resources by two populations of between individuals of a population. Some populations adopt resource partitioning to reduce the stiff competition and mitigate the disadvantages interaction leading to coexistence of competing populations.

i believe the correct answer from the choices listed above is the first option. the scientists need to look at the   validity of data, claims, hypotheses, and observations before  developing an argument. they base their arguments on facts that are present and they make sure they have proofs. 

explanation:

he is very short, and he can only reach halfway up on the elevator buttons. but on a rainy day, he has his umbrella with him, and he uses it to poke the button at the top.