Answer:Some body systems work together to complete a job. For example, the respiratory and circulatory systems work together to provide the body with oxygen and to rid the body of carbon dioxide. The lungs provide a place where oxygen can reach the blood and carbon dioxide can be removed from it.
Cells. Because they are the smallest living organisms on earth.
The Sun is the original source of energy in all food chains on the surface of the Earth and in the upper parts of the Oceans. Primary Producer. The green plants are the Primary Producers for the food chain. The energy from the Sun is converted by the plants into food.
I hope this is correct
Explanation:
(A) = Carbon dioxide and water. Because, photosynthesis is the process by which green plants manufacturer their food by combining water and carbon dioxide in the process of sunlight energy trapped by chlorophyll to produce carbohydrate and released oxygen. from the above definition we see that, Photosynthesis cannot occur without water and carbon dioxide present