What is the main difference between a cell nucleus and a nucleoid?
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a. presence or absence of a surrounding membrane
b. arrangement of the cytoskeleton
c. back and forth movement of a flagella
d. size of the organelle

Which best describes red blood cells? a. they are colorless b. they protect against disease-carrying microorganisms c. they transport oxygen throughout the body d. they aid in blood clotting

Where would you expect to see seedless plants, such as ferns and mosses? a. in a botanical museum, because they are all extinct b. low and close to the ground in a moist environment c. climbing high while circling the branches of another plant d. deeply rooted in a forest with a trunk that reaches 20 meters or more

What causes temperature extremes in the desert