You are likely referring to active immunity that can come from naturally acquiring the disease or vaccines. Both have T cells that fight pathogens and more antibodies are created to recognize viruses and the like and neutralize them. B cells can make more antibodies. There is a lot more detail to this question but hope it helps. Have a good day.
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Species diversity is concerned with both commonalities and differences. This is seen in the variety of species from mammals to insects. This shows the classifications of the species in the environment in order for them to survive and adopt to the changes and climate.
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