Which of the following can fix nitrogen?

Answer

A. human industrial processes

B. lightning

C. certain bacterial species

D. all of the above

There appears to be some relationship between population density and the presence of large dead zones.

The table below identifies three classes of genes that affect the cell cycle. Gene class Gene activity proto-oncogenes regulate progresses though the normal cell cycle oncogenes cause uncontrolled cell cycle progression tumor suppressor genes

The total magnification of a specimen viewed under a compound light microscope is determined by?

Autonomic nervous system sympathetic and parasympathetic

There is only one kind of chronology. True or False

which step in rock cycle occurs immediately befor sediments are laid down a. layers form b. heat and pressher are applided. c lava cools d. erosion breaks down rock

The blank theory of matter states that all particles of matter are in constant motion

Which of the following factors might a person consider in choosing job

A eukaryotic decomposer with a cell wall made of chitin is associated with which of the following Eubacteria Protista Archaebactria Fungi

Naturally occurring compounds in the earth are called what?