The worldwide total fertility rate changed from
__ children per woman to ___ children per
woman.
a. 2.5...6.5
b. 6.5...2.5
c. 1.5...8.5
d. 8.5...1.5
e. 3.5...4.5
B
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All bacterial and archaeal cells are diploid.
Answer the following statement true (T) or false (F)
The two identifying characteristics of addiction are
A) intolerance and independence. B) intolerance and dependence. C) tolerance and independence. D) tolerance and dependence.
During swallowing, the _____ covers the entrance to the larynx. This structure is identified and labeled as letter _____
in the above diagram.
a. epiglottis; E b. pharynx; B c. glottis; C d. epiglottis; C e. trachea; E
Which of the following describes a prezygotic barrier that could contribute to reproductive isolation?
a. A male moth lacks the specific sensory receptors for a pheromone produced by a female moth. b. Two grass varieties possess different mutant recessive alleles and offspring resulting from backcrossing with hybrids express more detrimental recessive traits. c. The offspring of crosses between lions and tigers cannot produce offspring themselves. d. Different salamander subspecies of a single genus produce offspring with each other, but these have shorter life spans than offspring of two parents within the same subspecies. e. None of the listed responses describe a postzygotic barrier.