16. The primary purpose of respiration is to (A) Use up oxygen
(B) Produce carbon dioxide
(C) Break down food substances
(D) Release energy from food substances

When analyzing tree rings, what do scientists assume a thin ring indicates?

Which of the following is likely not involved in this example of ecological succession? a) the rotting remains of plants add to the fertility of the soil. b)the soil becomes so fertile that eel grass is replaced by other plant species. c) the roots from plants stabilize the sediment, keeping it in place. d) the concentration of salt becomes so high that all plant life is destroyed.

The hardy-weinberg principle is that genetic frequencies in a population? will remain stable from generation to generation will always be changing will not be affected by environmental changes are always in a 3: 1 ratio