Human reproductive systems are best described as
A) perfect.
B) dioecious.
C) hermaphroditic.
D) budding.
B
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The minimum level of depolarization required to initiate an action potential in an excitable cell is called the ____
potential.
a. electrical b. refractory c. membrane d. resting e. threshold
Acid rain
a. attacks nylons. b. attacks marble statues. c. seriously damages the chemistry of the ecosystem. d. contains sulfuric and nitric acids. e. all of these.
n a dihybrid cross of AaBb × AaBb, what is the probability that offspring will have the dominant phenotype for trait A but the recessive phenotype for trait
a. 1/16 b. 3/16 c. 7/16 d. 9/16 e. None of these are correct.
A key step in the evolution of vascular plants was the ability to produce __________, a strengthening
polymer in the walls of cells that function in support and conduction. a. lignin b. cellulose c. starch d. fructose e. cutin