The passive movement of molecules or ions across a plasma membrane by means of a transports protein located in the plasma membrane
Answer:
Other chalcogens are oxygen, sulfur, tellurium, and polonium.
Answer: D :a brown bear hibernates and becomes inactive during winter.
Explanation:
Answer:How it indicates the health of the environment is when the less food, shelter, and mates cause population reduction and if nothing done to stop (or reduce) the amount of thing being taken away they could go extincted.
Explanation: Read above /\
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