Solve the equation for a=m-n for the variable n.

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.

i believe it is "they are not used up by reactions" as the answer to your question, text me back if this is correct because i just learned this.