What might happen to an organism if it could not adapt
to an external change?

it dies.

Explanation:

Survival of the fittest

If organisms cannot adapt to the changes in their ecosystem, they may move to another location. If they will not move, the species may become threatened, endangered or extinct. Changes to ecosystems can have tremendous effects on the organisms that live there. Sometimes organisms can adjust to these changes.

hope this helps a little

the peripheral nervous system or pns contains the nerves, which leave the brain and the spinal cord and travel to certain areas of the body. the peripheral nervous system's main job is to send information gathered by the body's sensory receptors to the cns as quickly as possible.

wegner's theory did not explain how the continents could move

explanation: