Secondary succession can only occur as a transition from primary succession.

Groups of organisms with low biotic potential, such as gray whales, that produce at most one offspring every other year a) are r-selected b) are k-selected c) are not subject to density-dependent limiting factors d) show the initial stages of the extinction process e) have escaped from the processes of natural selection and adaptation

Which worm has eyespots that are used to detect light? a fluke b marine worm c planarian d tapeworm

Sickle cell amelia is a condition condition where the red blood cells are deformed which is affected by sickle cell amenia