What were some of the earliest forms of life on Earth?
A) land plants and insects
B) corals and other bottom-dwelling sea creatures
C) microscopic creatures that built mound-shaped structures called stromatolites
D) sharks

Question

Quizplus · Accepted Answer

The earliest forms of life on Earth were indeed microscopic organisms that contributed to the formation of stromatolites, which are layered, mound-shaped structures created by the growth of these microorganisms in shallow water environments. These structures are some of the oldest evidence of life on Earth, dating back to over 3.5 billion years ago.

What Were Some of the Earliest Forms of Life on Earth