Read this description of the life cycle of a mushroom.

1. A mushroom begins to grow underground as a single-celled "spore."

2. The spore grows into multicellular structures called "hyphae."

3. The hyphae absorb nutrition and detect when conditions are right to sprout a mushroom above ground.

4. The sprouted mushroom then forms new spores that can enter the ground and begin the life cycle again.

Which sentence about this life cycle shows that mushrooms need energy and respond to stimuli?

4.) metal

"-the movement of carbon from the nonliving environment into living things and back to the environment

-carbon is the essential component of proteins, fats, and carbohydrates (which make up all organisms)

-carbon exists in air, water, and living organisms

-producers convert carbon dioxide in the atmosphere into carbohydrates during photosynthesis

-bacteria in the atmosphere cycles through the system in filtration units

-in cellular respiration, carbon is released back into the atmosphere as carbon dioxide

-some carbon is stored in limestone (forming one of the largest "carbon sinks" on earth)

-largest carbon reservoir on earth= limestone

-carbon stored in the bodies of organisms as fat, oils, or other molecules may be released into the soil or air when the organism dies

-this may form deposits of coal, oil, or natural gas (fossil fuels, which increased the atmospheric carbon dioxide)

-fossil fuels store carbon left over from bodies of organisms that died millions of years ago

-they are located in the surface of earth, deep within the earth and beneath the ocean floor."    

organ system-an organ system is a group of organs that work together to perform one or more functions. each does a particular job in the body, and is made up of certain tissues.

a chain link fence because there so tiny even my albino donkey can't get out