I believe this is a double replacement. As you can see none of the chemical symbols are missing, there just "replaced".
Answer:
For a good consert mix aggregate needed to the clean hard strong partical free of absorb chemicals or coating clay and other fine materials
independent variable: how much bread is there
dependant variable: temperature, location, time, size.
hypothesis, the one with the bread will be way more moist than the one without.
control group: no bread at all.
experimental group: brownies with bread
constants: same tupperware, placement, time, size.
Hoped this helped!
It is definitely a molecule
