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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its temperature is increasing. this causes molecular vibrations to increase.

the law of original horizontality explains:   why rocks appear in layers. correct answer: b the law suggests that all rock layers are originally laid down (deposited) horizontally and can later be deformed.   the principle is used by geologists to make assumptions about the relative ages of sedimentary rocks.