Giraffes probably used to have short necks. Over time, since the branches of trees or plants were out of their reach, they adapted to this by having a longer neck. Those with longer necks are able to reach the food and eat it that those with short necks could not. Obviously, those with longer necks are able to survive and therefore reproduce. Because of reproduction, they are able to pass on this characteristic that allowed them to survive on to their offspring. This leads to offspring doing the same and over time, affecting the entire population of giraffes and soon evolving giraffes. This is natural selection doing its work in the evolution of long necks in giraffes.
Because you get most of the vitamin D for the sun and it can help or damage your skin.
The answer to your question is D. Reactants
rain or thunderstorms
typically thunderclouds and storms are the post affect of a cold front, causing D to be your answer, MrKnowledge
<span>Cofactors are non protein chemical compounds. During DNA synthesis all DNA polymerases all share a two-metal ion-catalyzed polymerase mechanism. One of the metal ions attacks the primer hydroxly group, the second stabilizes the oxygen's negative charge. Magnesium ions are key to enzymatic reactions as they can generate magnesium-substrate scaffolds to which enzymes bond.</span>
