Answer:
variation in skin color.
Explanation:
The human skin color is determined genetically depending on the amount of melanin. However pigmentation can occur as a results of exposure to uv rays that causes induced pigmentation.
The sun emits two types of ultra violet rays which can reach can reach the skin namely the uva and uvb. Both type of rays can damage the skin if unprotected. Due to this there was evolution against the damaging rays. More melanin that provides a natural sunscreen to the people leaving in the tropic environment.
Factors that affect natural selection include variability among all, reproduction and heredity.because the genetic variability of these species may express genes that are not conducive to the evolution of the species
<h3>What factors affect natural selection?</h3>
For natural selection to occur, there are some factors:
- variability among all
- reproduction
- and heredity.
Variability between substances: Organisms of the same species have variations in their characteristics.
With this information, we can conclude that factors that affect natural selection include variability among all, reproduction and heredity.
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Organisms belonging to the same faimly would be the most closley related.
<span>Spinal cord injury is damage to the spinal cord that causes loss of sensation and motor control. respiratory problems from neurological damage or may be from immobility
injury at or above C5 -- complete loss of spontaneous respirations -- requires mechanical ventilation
thoracic cord injuries -- weakend exhalation and cough</span>
