The tendency to change physiologically depending on the environmental circumstances (such as fruit flies developing an extra abdomen when ether gas is around) is appropriately called
a. plasticity.
b. natural selection.
c. Lamarkian acquired characteristics.
d. survival of the fittest

a. plasticity.

Explanation:

Plasticity is an organisms ability to change physiologically depending on the environmental circumstances, it is the ability of an organism to change in response to an external stimuli by applying an appropriate physiological adaptive response.

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