How is the earthworm beneficial to the formation of soil? A)
They eat soil.
B)
They digest soil.
C)
They mix soil.
D)
They aerate soil.
E)
All of the above.

Of the pollutants that form acids in the atmosphere, which is easiest to reduce? a. sulfur dioxide b. nitrogen dioxide c. ozone d. carbon monoxide

Which conditions need to be in balance for cells to function? check all that apply. blood sugar food intake body water body temperature body mass

Which of the following statements about archaea and bacteria is true? a. neither is single-celled. b. they both have nuclear membranes. c. neither reproduces by binary fission. d. they both lack a nuclear membrane.