When you think of an organism changing its environment, you may think of large animals like humans that leave obvious signs of where they have been. however, even very small organisms make an impact on the environment. one small organism makes an impact by burrowing in the soil, to mix it and make it more fertile.

what animal create more fertile soil?
a) bacteria
b) earthworms
c) fungi
d) slugs

Why should the united state be concerned about air pollution in china?

After reading the paragraph below, answer the questions that follow. researchers have created a robot that has a very thin leg that is moved by cardiac (heart) cells contracting in unison. the robot, made of a polymer similar to that used in making contact lenses, is bathed in heart cells with supporting cells, which then attach to the robot and provide movement as they contract. all of the cardiac cells working together can cause the robot leg to move in a way that individual cells could not. this is an example of a. emergent properties of cells. b. energy flow through an ecosystem. c. adaptation. d. internal environment regulation.

Long-period comets come from the oort cloud particles in earth’s atmosphere material from the asteroid belt the kuiper belt