Which factors improve soil fertility? select the three correct answers.
a. horizons
b. bacteria
c. earthworms
d. humus
e. high ph

Which pair of quantities includes one quantity that increases as the other decreases during simple harmonic motion?

Which composition of water moves to begin a deepwater current?

Which best describes what forms in nuclear fission? a. two smaller, more stable nucleib. two larger, less stable nucleic. one smaller, less stable nucleusd. one larger, more stable nucleus