A(n) contains membranes that protect the embryo and provide it with nourishment while it develops in a terrestrial environment.
a. uterus
c. marsupial pouch
b. placenta
d. amniotic egg

Which of the following represents the results of a review of well-controlled studies of vitamin c supplementation on the resistance to, and recovery from, colds? there was a reduction in the duration of colds by 50% on the average. there was a slight effect on reducing the duration and severity of colds for people taking vitamin c supplements. there was a significant reduction in the duration of colds in people who consumed at least one gram a day. there was a significant reduction in the number of colds only in people who consumed > three grams per day.

Julia consumes 2,000 kcal per day. which of the following ranges allow her to stay within her amdr for calories from protein per day?

What is the function of reverse transcriptase in retroviruses? a) it uses viral rna as a template for dna synthesis.b) it converts host cell rna into viral dna.c) it translates viral rna into proteins.d) it uses viral rna as a template for making complementary rna strands.