Why does a plant cell need a cell wall of cellulose whereas an animal cell does not? the cell wall houses chloroplasts, which animal cells do not need. only animals have a cytoskeleton, which serves the same function as a cell wall in plant cells. plant cells receive structure from the cell wall to them remain upright, which animals do not need. water and minerals are transported through plant cell walls, whereas animal cells transport water and minerals through the cell membrane.

Plant cells receive structure from the cell wall to help them remain upright, which animals do not need.

climate change and pollution

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."