A prenatal diagnosis procedure that has recently
come into wide use can be performed earlier than
amniocentesis, and it involves sampling the
a. yolk sac material.
b. allantois.
c. chorion.
d. yolk sac.
e. umbilical cord.
Answer: c
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Bryophyte spores are dispersed by:
A. water. B. air. C. animals. D. Bryophytes do not have spores.
A digestive system with _____ is able to carry out various tasks of digestion at once
a. bilateral symmetry b. collar cells c. a one-way tube, a mouth, and an anus d. radula e. a two way sac-like cavity
According to the redundancy hypothesis, species are redundant if
A. they have an effect on the ecosystem that is disproportionate with their abundance. B. they could be eliminated or replaced by others with no loss of ecosystem function. C. their ecological niche overlaps somewhat with another species. D. they have grown beyond their carrying capacity for a particular ecosystem.
A couple has two female children. The probability that their next child will be male will be 35%.
a. true b. false