The mass extinctions that occurred 250 million years ago and 65 million years ago may have been due to gradual process or <span>Catastrophic events.
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This has to be B, none of the others make any sense
The kidneys filter the blood to excrete waste
the answer is the carbon cycle
Lakes are a famous source of freshwater, and always have freshwater. But humans influence that and cause some bodies of water to become contaminated. Hope my answer was useful.
