A secondary lateral meristem which consists of a ring of dividing cells that produce secondary xylem to its interior and secondary phloem to its exterior is known as
a. cork cambium
b. wood
c. vascular cambium
d. stem apical meristem
e. root apical meristem
Ans: c. vascular cambium
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Approximately _____ percent of human births in the U.S. are the result of in vitro fertilization
a. 0.5 b. 1.5 c. 5 d. 10 e. 25
Which of the following is not part of Darwin's mechanism of evolution?
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Which of the following statements about the speed of impulse conduction in a neuron is true?
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