Which of the following examples illustrates osmosis?
a. water leaves the tubules of the kidney in response to the hypertonic fluid surrounding the tubules.
b. digestive enzymes are excreted into the small intestine.
c. white blood cells consume pathogens and cell debris at the site of an infection.
d. calcium is pumped inside a muscle cell after the muscle completes its contraction.

an adaptation is a change or process by which an organism takes to be better suited for its environment. for example; migration is a behavioral adaptation, this is needed because birds are not built to last extremely cold climates. there are different adaptations because there are different species needing to adjust to different things, bears don't migrate; they hibernate.

d.

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