Question

There are millions of different species of animals, plants, and microorganisms. Which of the following factors do biologists consider to be the most important when classifying organisms?

A. details of internal and external body structures
B. environmental conditions of the organisms' habitats
C. inherited and acquired behaviors
D. general appearance

Answer 1

I believe its A -details of internal and external body structures

Answer 2

The answer is A. Morphology/anatomy is considered more relevant than behavior or general appearance in the classification of organisms. It is due to these anatomical features that animals such as bats are classified differently from birds (with bats classified as mammals even though they fly like birds) due to differences in anatomical features like milk-producing glands and brain structure.