Ecologists Conclude There Is a Biodiversity Crisis Because

Ecologists conclude there is a biodiversity crisis because

A) biophilia causes humans to feel ethically responsible for protecting other species.
B) scientists have at last discovered and counted most of Earth's species and can now accurately calculate the current extinction rate.
C) current extinction rates are very high and many species are threatened or endangered.
D) many potential life-saving medicines are being lost as species evolve.
E) there are too few biodiversity hot spots.