An organism can make its own organic molecules using simple inorganic molecules. does it qualify as a heterotroph?

Heterotrophs are not able to produce their own food. Alternatively, they acquire from organic substances for energy and food. Heterotrophs cannot obtain organic substances from inorganic molecules. Therefore, no, an organism without the traits mentioned does not qualify to be classified as a heterotroph. 

the element that provides strength to the exoskeletons of clams and oysters is phosphorus.

this is so because calcium carbonate is the main component in the shells. calcium carbonate is strengthened by phosphorus.

explanation:

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.