Gray wolves, once the top predators in yellowstone national park, were hunted to extinction there in 1926. in 1995, 15 wolves were brought to yellowstone from alberta. the wolf population has now grown to 300. the forest community in yellowstone national park can be described by a top-down model of community organization. wolves hunt and eat elk. elk are herbivores that prefer riparian vegetation (plants growing next to streams and lakes). ravens, bears, and eagles feed on elk carcasses. how would you expect the return of the wolves to yellowstone to affect the other species there?

The number of living organisms in a particular area is

Which of the following cell structures is significantly different between gram- positive and gram-negative bacteria?

(me out over the last several centuries, scientists have made the following broad observations while investigating several branches of the life sciences: -the fossil record shows that different types of organisms have existed at different times in earth's history. -many organisms have similar body structures that seem to be adapted to different ways of living in their environment. -organisms of different species often share similarities in stages of embryonic development. -many species share genetic similarities, and almost all organisms use the same basic building blocks to construct proteins. -often, the extent of two species' similarities can be predicted from their geographic closeness to each other. -a great deal of change has been observed among species that have experienced strong selective pressures through many generations. scientists have carefully considered and rigorously tested the observations listed above. when scientists offer a of these observations, they are making 1.) testable explanation, deductive explanation 2.) scientific interference, scientific law