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?
It is important because you need vitamins and minerals from them e.g. Scurvy no vitamin c
Lithosphere is the final layer on the planet Earth, erosion caused by wind (atmosphere) or rain (hydrosphere) may also wear down rocks in the lithosphere.
Answer: c. the wavelength of both transverse and longitudinal waves is measured parallel to the direction of the travel of the wave.
Explanation:
The wavelength is simply the distance that takes place between two successive troughs fir a particular wave. It is calculated as:
Velocity / Frequency.
From the statement given, the option that is accurate is that the wavelength of both transverse and longitudinal waves is measured parallel to the direction of the travel of the wave.
"Natural selection<span> is the differential survival and reproduction of individuals due to differences in </span>phenotype<span>. It is a key mechanism of </span>evolution<span>, it is a change of </span>heritable traits<span> in a </span>population<span> over time"</span>
