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.

the answer to your question is slate

cells use diffusion to get substances in and out of themselves. that diffusion will occur across the cell membrane or the outer covering of the cell. because we are talking about the surface of the cell, surface area and volume are  important factors here. as a cell increases in size, its surface area and volume increase as well.  we call that the surface area to volume ratio (sa: vol).  but the catch is that  volume increases at a greater rate than surface  area. in other words, as a cell gets bigger, the sa: vol gets smaller. so a really small cell like bacteria is mostly cell membrane (surface) with very little contents (volume). a really big cell like an egg, is mostly insides with a super thin membrane. so what ends up happening is that the cell cannot efficiently diffuse all of the stuff it needs in/out to survive. therefore cell size is limited to about 100mm. so how do we make organisms bigger than 100mm? cells divide! by dividing and becoming multicellular, organisms are able to grow!   check out the diagrams i attached to see the effect of sa: vol. i hope this ! good luck!