B. only 3% of water on earth is fresh
Carbon Dioxide is the main cause, but other effectors include nitrous oxide and <span>methane.
Hope this helps!</span>
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➜ <u>The important processes essential for maintaining life are</u>:
- Nutrition.
- Respiration.
- Transportation.
- Breathing.
- Movement.
- Excretion.
- Control and coordination.
