The cells of all organisms produce waste materials that must be removed or the cell will die. Organisms must also rid
themselves of waste products in order to survive. The process
by which both cells and organisms rid themselves of waste
materials is known as:
Respiration
Digestion
Excretion
Reproduction

Excretion is the process by which cells and organisms rid themselves of waste.

When humans burn fossil fuels, they release carbon dioxide, a potent greenhouse gas, into the atmosphere. The greenhouse gasses trap then trap heat from the sun in the earth's atmosphere, therefore causing the temperatures rise.

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