In parts of equatorial Africa, where the malaria parasite is most common, the sickle- cell allele constitutes 20% of the B-hemoglobin alleles in the human gene pool. The
sickle cell trait provides an advantage against malaria compared to people with
normal hemoglobin. In the United States, the parasite that causes malaria is not
present, but African Americans whose ancestors were from equatorial Africa have
the sickle-cell B-hemoglobin allele. These differences in traits illustrate

it's anything that aren't producers and consumers.

explanation:

you've got to be clear on what "this" is

equal distribution i think.

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explanation:

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answer:

the water molecules are transferred from the roots to the stem or top parts of the tall tree because of important properties of water which are adhesion, cohesion and capillary action. cohesion is the property of water molecules keeps water molecules in a combined state by sharing of bonds between them at the atomic level. adhesion allows the interaction of water molecules with other substances or substrate. adhesion will cause the attachment of water molecules to the wall of the vessel (xylem) of the plant. capillary action occurs when the adhesive force to the vessel wall is stronger than the cohesive force between water molecules. capillary action mimics the transfer of water from a tube or pipe. in this way water utilizes its property to transfer water from down to top level of the plant.