Speciation occurs over time. Parts of populations that were once the same change to the point of not being able to reproduce with each other any longer. Using the example of Darwin's finches, explain how geographical and genetic isolation can lead to speciation.

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

The law of thermodynamics states that energy can't be created or destroyed. to natural sources of energy on earth are the

What does the number 18.9984 represent in the image?