Question

bryozoans are microscopic aquatic invertebrates that live in colonies. some colonies of these organisms are attached to rocks and others are in jelly blobs. scientists have studied the fossils of these organism and found that bryozoans remained the same for 40 million years, then there was burst of change. then, fossil evidence showed that the evolution slowed down again.
which type of evolution, co - evolution, divergent, adaptive radiation, convergent, or punctuated equilibrium is best represented by these two organisms? justify your answer.

Explanation:

The problem is about Bryozoans' evolution. Punctuated Equilibrium is when evolution has long periods of stasis (little change) followed by rapid bursts of change. The text says Bryozoans remained the same for 40 million years (stasis) then had a burst of change, matching Punctuated Equilibrium.

Answer:

Punctuated Equilibrium. Justification: Bryozoans showed long - term stasis (remained the same for 40 million years) followed by a burst of change, which is the key characteristic of Punctuated Equilibrium (long periods of little evolutionary change interrupted by short periods of rapid change).