The nearest living relatives of alligators and crocodiles are:
A. snakes
B. birds
C. turtles
D. lizards
E. manatees
B. birds
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The act of nursing stimulates the contraction of smooth muscle cells in the breast. If a newborn infant is unable to nurse, then
A. progesterone secretion is not inhibited. B. milk is not produced. C. oxytocin is not secreted. D. prolactin is not secreted. E. prostaglandins are not secreted.
Microbes sometimes make metals such as mercury more volatile and lipid soluble by ________.
A. phosphorylation B. methylation C. aggregation D. None of the choices are correct.
Fossils of Cooksonia, which date to approximately ____ years ago, represent the oldest known fossils of vascular
plants.
a. 1.5 billion b. 425 million c. 250 million d. 125 million e. 17 million
Cattle benefit when _____ in their gut help them digest plant material
a. trypanosomes c. ciliates b. diatoms d. foraminiferans