Oxygen and carbon dioxide pass through the plasma membrane by facilitated diffusion or passive diffusion

The correct answer is option - passive diffusion

Explanation:

Diffusion is the movement of the substance molecules from a high concentration to low concentration region. It can be through carrier proteins or protein channels or without any help. The movement through the channels or carriers is termed as facilitated diffusion and diffusion without any help is known as passive diffusion.

The movement of the carbon dioxide and oxygen move through the passive diffusion as oxygen is non polar it does not need anything to move. Carbon dioxide is polar molecule but very small in size so they also move through passive diffusion.

Thus, the correct answer is option - passive diffusion.

desert perennials often survive by remaining dormant during dry periods of the year, then springing to life when water becomes available. most annual desert plants germinate only after heavy seasonal rain, then complete their reproductive cycle very quickly.

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what do the different brain waves do?

explanation:

brainwaves are produced by synchronised electrical pulses from masses of neurons communicating with each other. brainwaves are detected using sensors placed on the scalp. brainwave speed is measured in hertz (cycles per second) and they are divided into bands delineating slow, moderate, and fast waves.