The first organisms on Earth were very small, but now when you look around you see many large organisms. Which is the best explanation for this observation?
A) Evolution tends toward larger and larger organisms.
B) There were many steps necessary to go from small cells to large organisms.
C) Organisms got larger because they needed to use resources more efficiently.
D) The goal of evolution is to produce the largest organisms possible.

Question

Quizplus · Accepted Answer

The evolution of large organisms required many steps, including the development of complex organ systems, specialized cells, and new methods of reproduction. These steps took millions of years to occur, which is why larger organisms did not appear until much later in Earth's history.

The First Organisms on Earth Were Very Small, but Now