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.

just finished the test, the answer is d, greg is the least cost-effective because he charges the most for the project

c is the answer to this question. altitude affects the weather because air molecules evaporate.

the potatoes have high sugar concentrations and although these potatoes were different we could seethe effects that their sugar concentrations had in different environments. for example, the potatoes in sample a, were placed in pure water. this created a hypertonic environment and caused the potatoes to draw in water from its surroundings. we saw the opposite happen with the potatoes in sample b when placed in the sodium chloride solution. the potatoes in this case were in a hypotonic solution and therefore lost water to their surroundings.