The chemical formula for molecular oxygen is

O2, (oxygen 2)

Explanation:

the cell theory states that all living things including animals, as well as plants, are made of cells.

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.