Aresearcher discover two populations of birds that are similar. the two populations living habitats that are different. what evidence might suggest to the researcher that the birds belong to different species rather than the same species?

Vaccines are weakened forms of disease causing microorganisms, which are given to patients to prevent disease. after the vaccine is administered, the immune system responds by creating a(n) to recognize the a.) antibody, antibiotic b.) antigen, antibody c.)antibiotic, antibody d.)antibody, antigen

Resperation is a way to release carbon back into the atmosphere

There are fewer than 100 naturally occurring elements in the universe, but there are millions of different unified substances. explain how this can be true.