Because of age estimates of the Tiktaalik fossil species, at approximately 380 mya, it lived
A. in the Devonian era, before dinosaurs and mammals appeared.
B. None of the answer choices is correct.
C. during the Precambrian, when only primitive species were found in the fossil record.
D. in the Mesozoic era, with early dinosaurs, mammals, and conifer trees.
E. in the Cenozoic era after dinosaurs.
A. in the Devonian era, before dinosaurs and mammals appeared.
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In the single circulation of a fish, _______ and _________ are present.
A. one atrium, one ventricle B. two atria, one ventricle C. two atria, two ventricles D. one atrium, two ventricles E. no atrium, one ventricle
Volcanoes release carbon dioxide into the air during an eruption in what form?
a. carbon dioxide b. carbon monoxide c. methane d. ethane
Most of the plant body is composed of
a. dermal tissue. b. root tissue. c. ground tissue. d. vascular tissue. e. cork tissue.
Although Sulfolobus solfataricus grows at pH 2 to 4, it maintains a cytoplasmic pH of about 2, thereby generating a large pH gradient across the plasma membrane.
Answer the following statement true (T) or false (F)