2. . Why did scientists prior to 1977 believe that only very basic life forms existed in the deep ocean?

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.

oxygen +1 most likely

the three components of a nucleotide are the nitrogenous base, the phosphate group and the five-carbon sugar.