When water decomposes into oxygen and hydrogen, the mass

a. remains constant.
b. decreases.
c. varies according the number of hydrogen and oxygen molecules that form.
d. increases.

explanation:

crosscutting concepts have application across all domains of science. as such, they are a way of linking the different domains of science. they include patterns; cause and effect; scale, proportion, and quantity; systems and system models; energy and matter; structure and function; and stability and change.

i believe the answer is true.