Cells make up tissues, Tissues make up Organs, and Organs make up Organ Systems.
Answer:
The number of valence electrons in an atom is reflected by its position in the periodic table of the elements (see the periodic table in the Figure below). Across each row, or period, of the periodic table, the number of valence electrons in groups 1–2 and 13–18 increases by one from one element to the next
Lakes, oceans, glaciers, clouds, etc. It categorizes all forms of water on earth.
hydro = water
