[I choose a.]

Question

Preserving entire ecosystems rather than individual species is a good conservation strategy because
a.only endangered species will be saved
b.developers will have greater access to land
c.more than one species can be saved
d.it will not be necessary for environmentalists to study the ecosystem

How can preserving an entire ecosystem save only endangered species? Please think through this question and post a different answer.

c?

Yes! c is correct!