7. did NOT contribute to the mass extinction that ended the Paleozoic era. A. A meteorite impact
B. Widespread ice sheets
C. The formation of Pangaea

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.

the real answer is b. scintillation counter

that scientist would be robert hooke