A forest is a series of layers. The canopy is the topmost layer and made up of the tops of the tallest trees. The understory includes the trees and shrubs between the forest canopy and the ground cover on the forest floor. The understory is limited in size by the amount of sunlight that makes it through the canopy. Would you describe sunlight as a density-dependent or density-independent limiting factor for the understory population? Explain your reasoning.

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

Describe two recent or ongoing space missions.

Which of the following produces carbon dioxide? a. plants b. animals c. decomposers d. all of the above