The sickle cell allele can be maintained in the central African population, above the frequency of gene mutation (balancing selection), because the heterozygous sickle cell individuals have an advantage in lifespan, in this malaria stricken region, over the homozygous alternatives. Homozygous sickle-sickle individuals die early from the sickle cell disease. Homozygous nonsickle-nonsickle die early from malaria. The heterozygous sickle-nonsickle have a higher survival against malaria and therefore the sickle cell allele is balanced selected.
The fertile soils of the central rain forest draw people.
because furniture's have already lumber (or wood) that comes from the USA.
The migration of the Bantu speakers affected culture in the areas of central and southern Africa in a huge way. Some of the activities like farming were introduced and the Bantu language and other cultural values also spread rapidly.
it had a negative affect in the farming economy if Africa
When balancing a chemical equation, you multiply the subscripts in a chemical formula times the coefficient in front of the formula to get the total number of atoms of each element.
Organisms are affected by Natural Selection because Inherited characteristics affected the likelihood of an organism's survival and reproduction.
Natural selection is the process which determines the shark's evolution. It is humankind that is threatening the sharks' survival.
Populations evolve, but individuals are selected. Natural selection affects individual organisms.
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Adaptation for stronger shells.