<span>The correct answer is B. Human activity. That's why it is said that global warming si not natural because it's human created. This usually means that things like deforestation or usage of fossil fuels or freon or similar things brings climactic change, usually for the worse. Other mentioned aspects are all found in nature and are not something that we can affect. </span>
<u>Answer</u>:
Evolutionary process could cause several species to evolve into several hundred species
<u>Explanation</u>:
Being an evolutionary process, it gives rise to new species in more numbers. It is caused because of mutation upon a certain population for a long time. Various other mechanism can also lead to speciation. Another thing is also responsible for it that is genetic drift which leads to random ups and down in the population frequencies. That is helpful in evolution of several other species. Natural selection is also an factor for large evolution and species formation
Antibodies, White blood cells, complement system, lymphatic system, spleen, thymus, the bone marrow.