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 answer to your question is b

a

explanation:

many plants naturally reproduce this way, but it can also be induced artificially. horticulturalists have developed asexual propagation techniques that use vegetative plant parts to replicate plants. success rates and difficulty of propagation vary greatly. monocotyledons typically lack a vascular cambium and therefore are harder to propagate.