Hemoglobin is a(n) -rich protein that carries oxygen.
A. calcium
B. potassium
C. zinc
D. phosphorous
E. iron
E. iron
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Which of the following organs is not considered part of the digestive system?
a. tongue b. spleen c. gallbladder d. pancreas e. salivary gland
Which cell developmental process is likely to change the shape of the embryo without affecting size?
A. Cell proliferation B. Programmed cell death C. Cell movement or differential expansion D. Cell differentiation
Sieve-tube elements are food-conducting plant cells that are part of the
A) xylem. B) tracheids. C) phloem. D) sclereids.
Which of the following is an example of commensalism?
A. Wood-digesting flagellates living in the gut of termites B. A female mosquito sucking blood from a musk oxen C. Barnacles hitching a ride on the skin of a whale D. Acacia trees and their ants E. A tapeworm living in the intestines of a mule deer