It's something to do with the fact that having sickle cell anaemia reduces the chances of contracting malaria, obviously a very common disease in Africa. I'm not quite sure what the link is but hopefully this helps a little bit?
Changes within the uterus
A measure of the number of particles of a substance in a given volume would be concentration. <span>In chemistry, </span>concentration<span> is the abundance of a constituent divided by the total volume of a mixture. There are a number of ways expressing it such as molarity, molality, normality, ppm, percentage and the like.</span>
Optical microscope.
Hope this helps.
ANSWER:
C. Solute.
As stated in the definition of the noun solute, it is "the minor component in a solution." This means that it is the less abundant part of the solution.
Therefore, Option C ( solute ) is correct.
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Thank you <3