2)List the processes that add carbon dioxide to the air.
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Which of the following will not cause mass extinction? a. drastic change is weather b. geological change c. both a and b d. none of the above

What is the answer for the complicated molecules that make up living things usually contain carbon. why is carbon so important in these molecules?

The nervous system interacts with the endocrine system by a. using hormones as connections b. sending nerve impulses directly to glands c. using neuroendocrine cells as connections d. sending neurotransmitters directly to neurons