Nitrogen in the atmosphere must be "fixed" before it can be used by plants. Atmospheric nitrogen is "fixed" by A) plants. B) bacteria. C) bacteria and insects. D) bacteria and lightning.

Hemostasis involves which of the following components? Select one: a. Platelets, endothelium cells, and fibrin b. Platelets, fibrin, and collagen fibers c. Collagen fibers, endothelium cells, and platelets d.

Butterflies show r-selection traits. What does this statement imply?

Which of the following is NOT true of viruses? A. They usually infect specific types of cells. B. They're nonliving particles. C. They reproduce on their own without hosts. D. They're able to crystallize.

Is a hot dog a sandwich

if micheal jackson changed genders then what would he look and sound like and what would his name be?

Increased amount of carbon dioxide in the atmosphere can lead to global warming which that can lead to ...

A cell has a single line of chromosomes. what is the phase?

What would happen if flowery vines were growing all over the ceiling and walls

What happens to solar radiation after it reaches the earth? how do greenhouse gases warm the lower atmosphere?

What are questions scientist ask about sinkholes?