Which of the following is true about pH? a. Neutral is a pH of 0

b. Bases have a pH of 1-7

c. pH is the concentration of hydrogen ions

d. Acids have a pH of 8-14

What is the first step in a life cycle of a plant reproduce sexually

Rank the three variables in terms of how strongly they affect the "species" composition of the bacterial communities. place the variable with the weakest effect on the left and the variable with the strongest effect on the right.

When species lose their habitats they may..