Answer: Membrane transport proteins are specific and selective for the molecules they move, and they often use energy to catalyze passage. Also, these proteins transport some nutrients against the concentration gradient, which requires additional energy.
Explanation:
These greenhouse gases are trapping the heat inside the atmosphere. When more of these gases are released, it contributes to global warming and the melting of many polar areas that could potentially cause a natural disaster in the future.
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What do you think that a very wide space between two contour lines means?
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B.MOUNTAIN TOP</span>
Answer:
A living organism's position in the flow of energy through an ecosystem.
