natural immunity –>
innate immunity
This includes local barriers to infection such as skin, stomach acid, mucous, the cough reflex, enzymes in tears and saliva and skin oils.
Immunity to disease that occurs as part of an individual’s natural biologic makeup.Immunity brought about by the possession of suitable antibodies to fight the infection, which may have remained from a past infection or passed on from the mother.
Lymphocytes are a type of white blood cell capable of producing a specific immune response to unique antigens. In this tutorial, learn about these lymphocytes and the mechanisms they employ to defend the body against the same antigens...
Darwin's Finches are an example of natural selection in action. They are an excellent example of the way species' gene pools have adapted in order for long term survival via their offspring. See this tutorial for more elaborate info on natural selection as exemplified by Darwin's finches...
This tutorial investigates the genetic diversity in more detail. It also delineates how certain alleles are favored over other alleles in natural selection. ..
The diversification of several new species from a recent ancestral source, each adapted to utilize or occupy a vacant adaptive zone is referred to as adaptive radiation. 'Darwin's Finches' exemplified adaptive radiation. For more elaborate info on adaptive radiation, read this tutorial...
Multicellular organisms evolved. The first ones were likely in the form of sponges. Multicellularity led to the evolution of cell specializations that form tissues. Another major event was the evolution of sexual reproduction. The emergence of sex cells in the timeline provided a means for organisms to further diversify. Know more about these crucial events in geologic time in this tutorial...
According to Charles Darwin's theory of natural selection, preferable genes are favored by nature in the gene pool, and over time, these preferable characteristics become more exclusive in the gene pool. This tutorial rounds up all the factors that can alter the makeup of a gene pool...