Which of the following structures becomes
part of the placenta?
a. chorion
b. amnion
c. blastocoel
d. yolk sac
e. more than one of these becomes part of the
placenta
A
You might also like to view...
Mechanisms that evolved in plants to regulate the rate of water loss do not include
A. becoming dormant during dry times of the year. B. losing leaves. C. producing leaves that are thick and hard. D. containing stomata in crypts or pits. E. increasing the number of water vacuoles in the cells.
As the size of the wolf population in Yellowstone National Park has increased, many wolves have migrated from the park into areas around the park. This migration is the result of
A. population pressure. B. sex ratio changes. C. natality. D. gene frequency changes.
The molecule that traps the sun's energy is
A. ATP. B. glyceraldehyde-3-phosphate. C. chloroplast. D. chlorophyll.
When salt is dissolved in water, water is the
a) reactant b) solution c) solute d) solvent