Question

what do we call an organism that is well adapted to its environment
flavorful
fluffy
fit
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Explanation:

In biology, an organism well - adapted to its environment is described as 'fit'. Fitness in biology refers to an organism's ability to survive and reproduce in its environment. 'Flavorful' relates to taste and 'fluffy' to texture, neither of which describe an organism's adaptation to its environment.

Answer:

fit