The group of protons and neutrons are known as what ? A. Nucleons B. Positrons C. Megatrons D. Neutrons

This is an active transport mechanism by which cells pump sodium and potassium ions against the concentration gradient

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.

Qué sucede cuando una persona tiene muy poco o demasiado costeroides?