IDNLearn.com: Your trusted source for accurate and reliable answers. Get the information you need from our community of experts who provide accurate and comprehensive answers to all your questions.

The term "biodiversity" refers to
a. A study of ecosystems without consideration of the living organisms.
b. The similarities between species.
c. The rate of extinction of species due to human activities.
d. The total number of species, variation of species, and the ecosystems in which they live.
e. The study of food chains within an ecosystem.