Answer:
Carbon dioxide (CO2) and water (H2O)
The answer is C. Pathogens
The second on :” the number of valence electrons stays the same” because a valence electron is the number of electrons on the outer shell of the atom and if it’s in group one then the outer shell of any element will have one electron on its outer shell
Extracellular fluid<span>-the fluid outside the body's cells
-either in the bodies tissues or as plasma (liquid portion of blood)</span>