Question

Why do you think species remain in a stage of stasis?

a. A stable ecological niche leads to absence of selection pressure, which in turn causes species to remain unmodified or in stasis.
b. An unstable ecological niche leads to various selection pressures, which in turn causes the species to remain in a stage of stasis.
c. A stable ecological niche leads to various selection pressures, which in turn causes species to remain unmodified or in stasis.

Answer 1

The correct answer is option C

A stable ecological niche leads to various selection pressures, which in turn causes species to remain unmodified or in stasis.

Reason:

In the stage of stasis a species has evolved up to its maximum extent and there is no scope for further evolutionary changes. The species must possess necessary traits to survive in the changing niche. Thus there must always be scope for selection pressure with in a given ecosystem so that the species must learn to be stable under the varying conditions after reaching a certain optimum level of modification.

Answer 2

c. A stable ecological niche leads to various selection pressures, which in turn causes species to remain unmodified or in stasis.