In the Last 20 Years One Concern of Scientists Who

Multiple Choice

In the last 20 years one concern of scientists who study amphibians is that

A) genetic diversity is being increased too rapidly for proper maintenance.
B) the edge effects are causing declines in species numbers.
C) DDT is affecting reproduction by thinning the egg membranes.
D) populations are diversifying rapidly and speciation is occurring.
E) many species are declining or have gone extinct in recent years.