The answer is A The pancreas regulates blood glucose through hormones.
Narcotic drugs are analgesic that exert a depressing action on the central nervous system.
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A rainforest ecosystem would have a more high species riches. There are vast resources such as trees and plants that contribute to animal life. More animals live in these ecosystems because of the environment itself.
A dessert ecosystem would have a low species riches. There is little plant life and low resources for survival. Only animals that have adapted to this environment have a high species rate.
