Pneumonia is a leading cause of death.
Double fertilization is a complex fertilization mechanism of flowering plants. This process involves the joining of a female gametophyte with two male gametes. It begins when a pollen grain adheres to the stigma of the carpel, the female reproductive structure of a flower.
Answer:
-It ensures life on Earth can exist.
-It is used by plants for photosynthesis.
-It is the main component of many biological components, including blood.
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Because most air pollution is caused by the burning of fossil fuels burned in the home