Which of the following statements is true regarding bacteria and animal cells?
a.
a bacterial cell is much smaller than an animal cell.
b.
an animal cell is much smaller than a bacterial cell.
c.
an animal cell contains a cell wall, but a bacterium does not.
d.
a bacterium contains a nucleus, but an animal cell does not.

The most accurate answer is A.

Bacterial cells are  generally very small, almost 10 times smaller than most animal and plant cells. Most bacterial cells measure about  0.2 to 10 microns or micrometers which in inches is 0.0000079 to 0.00039.

One of the reasons that bacterial cells are so small is that they require a large surface area to volume ratio to be able to take in nutrients. They take in nutrients from their surroundings through the process of diffusion.

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water pollution kills aquatic life. aquatic life includes algae and other plant life that use photosynthesis. photosynthesis takes   c02 out of the air.  

c02is a greenhouse gas.

a rain shadow is a dry region of land on the side that is protected against the prevailing winds of a mountain range. the prevailing winds are the winds that occur most of the time in a particular place of the earth

prevailing winds carry air toward the mountain range. as the air rises up over a mountain range, the air cools, water vapor condenses, and clouds form. on this side of the mountains, called the windward side, precipitation falls in the form of  rain  or snow. this dry air produces a  rain shadow.