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Salmon hatch in a freshwater stream, migrate to and live several years in the open ocean, and then migrate back to their natal stream to reproduce. What two mechanisms are thought to be involved in these movements?
Age
The length of time that a person has lived or a thing has existed.
Hormone Replacement Therapy
A treatment used to supplement or replace hormones in individuals with hormonal imbalances or deficiencies.
Health Outcomes
The results of healthcare interventions and measures on the health status of individuals or populations.
Laboratory Tests
Diagnostic tests carried out in a controlled environment to analyze bodily fluids or tissues for the purpose of identifying diseases or disorders.
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