Answer:
Reproductive isolation can occur when individuals or the populations exhibit differences in the timing of various activities like mating and so on .
Is the flu vaccine a answer? If so I’m pretty sure that’s the answer.
Pathogenic protozoa comprise a large number of eukaryotic microorganisms which are the causative agent of important parasitic diseases. Some affect human and are of high medical relevance as malaria, toxoplasmosis, leishmaniasis, the Chagas disease, sleepiness disease, amebiasis, giardiasis, and trichomoniasis.
Depending on the insurance company, some health care ones do that for the reason being about your health.
The answer is: " a gradient " .
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Hope this helps!
Best wishes!
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