Which of the following can be accurately said about climax communities?
A. Climax communities are always stable.
(B. Restoration of the original climax community is always achieved at the same rate.)
C. Climax communities are always uniform.
D. Restoration of the original climax community may not always happen.
Compared to atoms of the same element, isotopes have different
A. numbers of neutrons.
B. numbers of protons.
C. types of subatomic particles.
(D. numbers of electrons.)
Which of the following accurately describes the pH scale?
A. The lower the concentration of hydrogen ions, the higher the acidity is.
B. The greater the pH is, the lower the acidity is.
C. The greater the concentration of hydroxide ions, the higher the acidity is.
(D. The lower the pH is, the more basic the solution is.)