Which of the following depends on bacteria?
a. conversion of dead organic matter to fossil fuel
b. photosynthesis
c. dissolution of phosphates from rock
d. nitrogen fixation

There is a liquid capsule inside a cup full of liquid. the cup full of liquid has salt in it and the liquid capsule has no salt in it. in which direction will the solvent flow? a. the salt does not have to move b. from the capsule to the larger cup c. equally between the capsule and the cup d. from the larger cup to the capsule

Which of the following is not a symptom of desertification? a) decrease in salt content of the soil b) lowering of the water table c) reduced surface water d) increased soil erosion e) loss of native vegetation

Dna replication or repair occurs in a cell in all of thw following situations except when