Atypical cactus has a green stem and thin, spike like needles that are not green in which of its parts does a cactus perform photosynthesis explain

Asquirrel population lives in an area. over many years, a river in that area grows wider and stronger, eventually forming a canyon. the squirrel populations on the two sides of the canyon can no longer mate with each other and ultimately form distinct species. this is an example of

How dose plate tectonics effect climate

Sickle cell amelia is a condition condition where the red blood cells are deformed which is affected by sickle cell amenia