QUESTION: Select the correct answer.
Sickle cell disease is a hereditary mutation that causes the red blood cells to deform, decreasing their ability to carry oxygen. Based on the image, what kind of mutation occurs to cause sickle cell disease?

ANSWER OPTIONS
deletion
duplication
substitution
translocation

Elephants in the savanna regions of africa dig holes in dried up river beds to reach water lying just below the surface. these holes provide drinking water for other animals as well. so, without the elephants, many animals might otherwise die from lack of water during the dry season. the location in which the elephants live is an example of a/n and the role they play in creating water holes is an example of a a) ecosystem; habitat b) community; niche c) habitat; niche d) niche; habitat