Question

question 7
why did scientists only include plants and animals in the initial classification levels describing life?

Explanation:

Initially, plants and animals were most visible and distinct forms of life. Microorganisms and other life - forms were not well - known or understood due to limitations in observation tools like microscopes.

Answer:

Plants and animals were the most obvious and distinguishable life - forms, and other life - forms like microorganisms were not yet discovered or well - understood because of technological limitations in observation.