Which statement best explains why the atmosphere is considered an open system? a there is no definite boundary separating it from outer space. b energy and matter can enter and leave. c its molecules can move freely, without resistance. d it can accept an unlimited amount of energy.

the answer is b. energy and matter can enter and leave.

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.