Which of the following phyla have representatives that exhibit radial symmetry throughout their entire lives
a. annelids
b. cnidarians
c. mollusks
d. arthropods

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.