The amniotic egg was a key adaptation allowing vertebrates to make the transition to life on land where diffusion to/from a watery environment could not allow a developing embryo to meet its metabolic needs
Its three membranes are the _____, which surrounds the embryo
in a watery sac; the _____, which sequesters metabolic waste away from the developing
embryo; and the _____, which surrounds the embryo and other sacs.
A. amnion; chorion; allantois
B. chorion; amnion; allantois
C. chorion; allantois; amnion
D. amnion; allantois; chorion
E. allantois; chorion; amnion
D
You might also like to view...
The shorter urethra in females is one reason why urinary tract infections are more common in females than in males.
Answer the following statement true (T) or false (F)
The diploid number of chromosomes found in a eukaryotic cell
a. indicates the phylogenetic position of the organism. b. is constant during the life cycle. c. is haploid among asexually reproducers and diploid if they reproduce sexually. d. is cut in half by meiosis and is restored by fertilization. e. is dependent on the age of the tissue.
Bioengineered hamster ovaries produce blood-clotting factor VIII for human use. This method is better
than obtaining the factor from human blood because a. it is cheaper. b. it is more natural. c. there is no risk of transmitting blood-borne diseases. d. larger quantities are produced. e. it is faster.
About how often have catastrophic destructions of the magnitude of the end-Cretaceous bolide impact occurred?
A) at intervals of a billion years B) at intervals of 10 to 100 million years C) at intervals of 10 to 100 thousand years D) only once