In terms of numbers, the most common life-forms on Earth are
A) humans
B) fish
C) microscopic creatures, too small to see with our eyes
D) birds
E) insects

Question

Quizplus · Accepted Answer

Microscopic creatures such as bacteria, viruses, and other single-celled organisms make up the vast majority of life-forms on Earth. They are found in every habitat and ecosystem, and their sheer numbers are difficult to comprehend.

In Terms of Numbers, the Most Common Life-Forms on Earth