Which of these best represents natural selection?
A) Recessive albinism is more common among the Hopi of Arizona than in the general population of the U.S.
B) A gradual change in specific human mitochondrial DNA sequences occurs along the Nile river in Egypt.
C) ABO blood type frequencies are similar in northern Africa, southern Spain, and the middle east.
D) Lactose tolerant alleles are very prevalent in herding populations that drink milk as a staple.
D) Lactose tolerant alleles are very prevalent in herding populations that drink milk as a staple.
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Molecules that consist of two or more different elements in proportions that do not vary are called ________
a. elements b. compounds c. radioisotopes d. ions
Which area has the highest nitrogen deposition?
A) East Coast B) West Coast C) South D) Midwest
Flowering plants appeared in the fossil record in the:a
Tertiary period. b. Cenozoic era. c. Paleozoic era. d. Late Cretaceous period. e. Jurassic and Lower Cretaceous periods.
Which mode of transit has the greatest energy consumption?
A. Sedan B. SUV C. Bus during peak hours D. Bus during off-peak hours E. Pickup truck