Theodor Schwann, another writer of the cell theory, studied tissue and noticed that every sample he looked at was made of cells. (Hint: think about what his last name sounds like)

A50.0g sample of liquid water at 0.0 c ends up as ice at -20.0 c. how much energy is involved in this change?

The excretory system,need answers for all: )

The chemical equation below shows the reaction of sodium (na) and chlorine (cl) to form sodium chloride (nacl). 2na + cl2 → 2nacl in this equation, which of the following is a reactant? i. sodium ii. chlorine iii. sodium chloride