Movable spines are found on ____ of the phylum Echinodermata
a. Ophiuroidea
b. Echinoidea
c. Asteroidea
d. Crinoidea
e. Holothuroidea
b
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Areas that receive heavy rainfall tend to have ____ soils, and arid regions tend to have ____ soils
a. acidic; alkaline b. pH-neutral; acidic c. alkaline; acid d. acidic; pH-neutral e. pH-neutral; alkaline
Chemical signals that mediate interactions between two or more members of a given species are called _______________.
A. pheromones B. alarm signals C. hormones D. competitive exclusions
Skeletal muscle
A. is made of extremely small cells with one nucleus. B. has bands of actin and myosin filaments perpendicular to the length of the cell that produce contractions. C. is not under voluntary control. D. is found in the walls of the intestines and stomach.
Which of the following is true of iodine?
a. Many pregnant women in the United States are likely deficient in iodine. b. Iodine toxicity significantly impairs brain development and function. c. Iodine has many well-established roles in the body. d. The majority of iodine in the American diet is provided by seafood.