Lichen is a composite organism made from the symbiotic association of algae and fungi.

the algae undergo photosynthesis and provide food for the fungi. the fungi provide anchorage and protection for the algae.

algae and fungi share a .

blank 1:

a. mutualistic

b. parasitic

c. prey-predator

however, some fungi cause diseases in humans. these fungi

blank 2:

a. commensal

b. mutualistic

c. parasitic

the answer is b because, investigating whether another species of moth also drinks tears might be interesting, but it would not directly explain why this species of moth does.

to explain why this species of moth drinks tears, the scientist could ask: "what nutrients that moths need are in elephant tears? "

the scientist could experiment with moth repellent or oter ways to keep the moths away, but that would not answer his original question.