Nitrogen is a major component by which plants use sun energy to produce sugars from water and carbon dioxide. (It is also a major component of amino acids)
Answer:
Air Pressure
Explanation:
Air pressure is the only option here related to weight. And Air Pressure does get lower the higher the airplane goes.
Answer:
sounds hard have a good day
Explanation:

In humans, the medulla region of the brain is mainly responsible for the regulation process of respiration. It is also called the respiratory rhythm centre. The chemosensitive area located near the respiratory centre sends signals across nerve impulses to alter the rate of expiration to eliminate compounds.
Answer:
Trans-membrane proteins.
Explanation:
Membrane proteins are proteins that are found in the cell membranes of living organisms.
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