What structure is formed from both fetal and maternal tissue?
A. chorion
B. placenta
C. yolk sac
D. amnion
B. placenta
You might also like to view...
Which one of the following is a type of species interaction with impacts that depend on prey density and effectiveness of defenses to determine the short-term impact on the prey population?
A) competition B) consumption C) mutualism D) commensalism
The first land plants were bryophytes, which then branched into ferns, gymnosperms, and finally angiosperms. What advantage did angiosperms have over gymnosperms?
a. Angiosperms can produce flowers and fruits to aid in seed dispersal b. Angiosperms produce pollen and do not require water to reproduce c. Angiosperms go through alternation of generations d. Angiosperms have a vascular system, this allowed them to grow taller e. The angiosperms can produce spores which are more stable than seeds from gymnosperms
Loose connective tissue proper contains
A) fixed and wandering cells B) a tight framework C) parallel, packed fibers D) a solid ground substance E) only elastic fibers
A hypothesis can best be described as a(n):
a. data point b. conclusion c. observation d. tentative explanation e. stepwise problem-solving approach