The answer is A or the first one
Active transport. Which the molecules are transported by a protein called carrier protein with the help of ATP.
Target Tissues or organs <span />
Answer:
4 valence electrons
Explanation:
Because of the relative stability, these atoms often form covalent bonds rather than ionic bonds that need a charge. One example is Carbon. It has 4 valence electrons, so it can make a 4+ or a 4- charge.
