Which of these describes an example of a keystone species that scientists should make efforts to protect? A. More than 1,000 newly hatched wood frog eggs in a forest ecosystem.

B. A gopher tortoise that provides a home to more than 300 different species of animals in its burrow.

C. A nonnative population of lionfish living on a coral reef in Florida that have no natural predators.

D. A population of mistletoe plants that are parasitic because they depend on other trees and plants in the ecosystem in order to get what they need to survive.

(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