Diffusion, movement of particles across a membrane is driven by differences in
a. concentration.
b. shape.
c. force.
d. size.

Which of the following choices is not an effective solution to the energy waste related to inefficient lighting? a. using low-pressure sodium lighting sources b. pointing lights on billboards and street signs upward c. placing light sources on time controls d. shielding light to direct it downward

1) what three conditions must be present for minerals to form through natural processes? 2) why are minerals considered inorganic substances? 3) how do oxides differ from other minerals that contain oxygen atoms? 4) how is a sulfide different from a sulfate? what makes native elements unique?

Drag the tiles to the correct boxes to complete the pairs. match the nitrogenous base of dna with its complement.