The majority of mammal species living today are ____, or placentals, including such diverse groups as rodents, bats,
whales, and primates.
a. protherians
b. therapsids
c. anthropoids
d. eutherians
e. metatherians
ANSWER: d
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Why does extended hypoglycemia (low blood sugar) lead to confusion and difficulty thinking?
A. Unregulated pH of body fluids causes these symptoms. B. Glucose provides energy for brain cells. C. Glucose is required for chemical reactions in the body. D. Glucose is major source of energy for non-nervous system cells.
Amphibian and most reptiles have
a. a two-chambered heart with two blood flow circuits. b. a three-chambered heart with two blood flow circuits. c. a four-chambered heart with two blood flow circuits. d. a three-chambered heart with one blood flow circuit. e. a two-chambered heart with one blood flow circuit.
Cells placed in hypotonic solutions will ________.
What will be an ideal response?
Which of the following statements about allopolyploidy is false?
a. It can result in a new, reproductively isolated species in just one generation. b. Many flowering plant species are allopolyploids. c. It accounts for a large portion of the remarkable species diversity observed on Earth today. d. The hybrid may have a combination of traits conferring greater fitness than the parent species. e. The hybrid may assume a new role in the environment and so coexist with the parent species.