6. which process breaks energy-rich molecules down and releases energy-poor molecules?
which process uses energy-poor molecules to build an energy-rich one?

Hydrolysis process and ligation process

Explanation:

The process named hydrolysis helps in the breakdown of energy rich molecules to release energy poor moor molecules in presence of water

For example Adenosine tri phosphate (ATP) in presence of water undergo  hydrolysis to generate Adenosine di phosphate(ADP) and inorganic phosphate(Pi).

On the other hand ligation reaction helps in the synthesis of energy rich molecules by using energy poor molecules.

For example the reaction of ADP with inorganic phosphate(Pi) result in the formation of ATP a energy rich molecule.

explanation: grsaa

the way that the mass of carbon can be conserved through cellular respiration is through a process/law called the law of conservation of mass which even tho it undergoes a process, mass is not be destroyed or changed