Gases are exchanged in a mammalian embryo in the
A) amnion.
B) hypoblast.
C) chorion.
D) trophoblast.
E) yolk sac.
Answer: C) chorion.
You might also like to view...
A characteristic of arthropods that has allowed for their great success is the presence of ________
A) bilateral symmetry B) an endoskeleton C) a brain D) specialized segments
According to the doctrine of natural rights:
A) people behave in ways that allow them to obtain favorable outcomes. B) all persons are created equal and are entitled to the same opportunities and protections. C) inalienable rights are considered to be self-evident and universal. D) inalienable rights cannot be surrendered by citizens to the sovereign.
What do type A positive and AB negative blood have in common?
A. anti-B antibodies and Rh antigens B. A antigens C. A and B antigens D. A antigens, anti-B antibodies E. A antigens and Rh antigens, anti-B antibodies
The sides of the DNA ladder (backbone) are
A. the R groups. B. alternating carbons and nitrogens. C. the nitrogenous bases. D. alternating nitrogens and phosphates. E. sugars and phosphates.