Genetic variation<span> occurs </span>mainly<span> through DNA mutation, gene flow (movement of genes from one population to another) and sexual reproduction</span>
Sickle Cell Anemia
Hope this helps (:
<u>Ground tissue</u>, which is also known as cortex, is the main plant tissue shown in green in the image.
A star is a fusion reactor. Under enormous pressure, resulting from gravity, light nuclei of gases such as hydrogen merge to form helium, and since this process releases energy, the start begins to radiate the excess energy. Later on, helium fusion produces heavier elements, and so on.
The answer is to your question is A
