Which of the following statements are true regarding passive transport? Choose 2 answers:
Simple diffusion, a type of passive transport, requires the use of membrane proteins.
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Oxygen cannot enter a cell through passive transport.
Carbon dioxide can pass through a cell membrane via passive transport.
Charged ions cannot pass through a cell membrane via passive transport.

Oxygen cannot enter a cell through passive transport.

Carbon dioxide can pass through a cell membrane via passive transport.

Explanation:

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the nitrogen cycle provides nitrogen to the ecosystem from the atmosphere, ground and oceans. nitrogen is an important component of complex molecules such as amino acids and nucleotides, which lead to the creation of proteins and dna, the building blocks of all life. plants absorb nitrogen in the form of ammonium, nitrate ion and, on rare occasions, as amino acids. animals receive nitrogen necessary for biological processes from feeding on living or dead organic matter.