The direct visualization of a developing fetus to diagnose disorders is called
a. chorionic villus sampling.
b. preimplantation diagnosis.
c. amniocentesis.
d. fetoscopy.
e. senescence.
D
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Emphysema affects about __________ million
people in the United States in a given year. a. 1 b. 2 c. 3 d. 4 e. 5
At which point or stage would the majority of cells in the embryo no longer be stem cells?
A) the pre-embryo stage B) in the blastocyst C) after the organs start to develop D) A large number of stem cells would exist in all these stages.
Following ovulation, rising levels of estrogen
A) stimulate the endometrium to continue to proliferate. B) inhibit the production of progesterone. C) initiate a hormone cascade that triggers LH to rise, then FSH, followed by a sharp decline in GnRH. D) promote the release of the "old" endometrium. E) prevent implantation of the zygote.
In the figure on the right, each point represents data on females from a different species of bird. In total, 10 species are represented. What can you infer about survival and clutch size?
A) Animals with high fecundity tend to live longer. B) High clutch sizes tend to produce animals with low survival. C) Animals with high fecundity tend not to live as long as animals with low fecundity. D) Animals with low survival tend to have low clutch sizes.