Salmon fish hatcheries add a harmless perfume (morpholine) to a stream when they release young fish. when the fish mature, they attract them back to the home stream by using this chemical (in nature the fish smell the unique odors of soil and trees along the home stream). in effect, the hatchery biologist is using
a. the fish's inborn instincts to relocate its own stream.
b. the fish's inborn instincts to relocate its own stream.
c. an experiment based on the ability of fish to learn by trial and error.
d. chemotropisms.
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