Loss of Worldwide Biodiversity Is a Serious Problem

Loss of worldwide biodiversity is a serious problem.How would ecological measurements attempting to quantify the loss of biodiversity be likely to differ from quantification studies in other fields of science?

A) Ecologists typically do not do measurements; they rely on qualitative data.
B) Ecologists can only use field observations; they cannot conduct experiments.
C) Ecologists depend mainly on models of natural systems, which are difficult to build.
D) Biodiversity is not an ecological process; therefore, no method exists for measuring it.
E) Ecological processes occur at different space and time scales, which may be difficult to coordinate.