Erectile dysfunction drugs cause
a. penis muscle to contract.
b. blood vessels of the penis to widen.
c. the spongy tissue of the penis to stiffen.
d. an increase in hydrostatic pressure.
e. increased semen flow
B
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Spina bifida is one of the most prevalent of human birth defects. The defect usually involves the spinal cord or the spinal canal opening to the outside of the body. Spina bifida results from problems during the formation of the _____
A) neural tube B) gastrula C) notochord D) somites E) blastula
The ____ is an exchange organ formed by material and fetal tissues, and represents an effective barrier against most microorganisms in the maternal circulation
Fill in the blank(s) with the appropriate word(s).
The relative fitness values of three genotypes are: wAA = 1.0, wAa = 1.0, and waa = 0.7. If the population starts at the allele frequency p = 0.5, what is the value of p in the next generation?
a. 0.46 b. 0.50 c. 0.52 d. 0.54 e. 0.58
Plant cells have a ______ cell wall, with _____ as its main component.
Fill in the blank(s) with the appropriate word(s).