The rapid diversification of species seen in the fossil record followed by long periods of stasis is part of the ________ model of evolution.
A. symmetric
B. spatial
C. punctuated equilibrium
D. graduated
Answer: C
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Which type of modified stems are typical of plants that historically have needed to protect themselves from mammalian herbivores?
A) blades B) tubers C) stolons D) thorns E) rhizomes
What is true about about mammalian red blood cells?
A. Red blood cells are also called leukocytes. B. A mature red blood cell is shaped like a biconcave disc because it has no nucleus. C. Red blood cells develop from lymphoid stem cells. D. Red blood cells contain albumin. E. Aged red blood cells are removed from the blood by the kidneys.
The outermost membrane that forms the majority of the placenta is the
a. amnion. b. allantois. c. chorion. d. yolk sac. e. umbilical cord.
The importance of dietary fiber includes all of the following EXCEPT
Select one: a. dilution of bile salts. b. addition of bulk to the digestive tract. c. a decreased risk of constipation. d. a possible decreased risk of polyp formation. e. increased blood cholesterol levels.