Why does the earth's co2 level go up and down every year?
1.because the leaves in the fall die and fall off releasing carbon dioxide and performing
less photosynthesis allowing for more carbon dioxide in the atmosphere
2.we don't know
3.because the leaves in the spring and summer contribute to photosynthesis removing
more carbon dioxide

science-ocean floors and habitats study guide by volleyballqueen3817 a major advance in ocean-floor mapping. list four sections of the ocean floor. algae that use sunlight to produce their own food through photosynthesis. all of the feeding relationships that exist in a habitat. drying out, predators, find food.

age range would be the answer