Examlex
The primary mode of HIV transmission worldwide is by injecting drugs.
Fossil Record
The accumulation of documented fossils, revealing information about past life, evolutionary processes, and the history of the earth.
Reproductively Isolated
A state in which two populations can no longer interbreed to produce fertile offspring, leading to the emergence of separate species.
Mating Behaviors
The actions or sequences of actions performed by animals as part of the courtship leading to reproduction.
Hosts
Organisms that harbor another organism (parasite, mutualistic symbiont, or commensal) providing nourishment and shelter.
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