Chains of enzyme reactions that break down or build molecules are called
pathways.

Chain of enzyme reaction that break down or build molecules are called as metabolic pathways.

Explanation:

Metabolic pathways are enzymes which regulates the chemical process. Metabolic pathways are chemical reactions which stimulates a cellular process in the cell.

Usually proteins help these metabolic reactions to take place in a cell. Proteins are necessary for any enzyme to work appropriately.

For any cellular process to work catalysts are important. They need a nudge and a push for the process to happen adequately.

the law of original horizontality explains:   why rocks appear in layers. correct answer: b the law suggests that all rock layers are originally laid down (deposited) horizontally and can later be deformed.   the principle is used by geologists to make assumptions about the relative ages of sedimentary rocks.