Why are lampreys classified as vertebrates?
A) They lack gills.
B) They are ectothermic.
C) They lack jaws.
D) They have an exoskeleton.
E) Their nerve cord is surrounded by cartilage.
E
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All of the following are germ layers EXCEPT
a. ectoderm. b. mesoderm. c. epiderm. d. endoderm.
To avoid sinking the purple sea snail
a. uses jet propulsion from the mantle to move upward. b. has wings on its foot for swimming. c. has gas vacuoles in its shell. d. produces a bubble raft surrounded by mucus. e. fills its liver with low-density oil.
Most plants incorporate carbon dioxide into sugars by means of a cycle of reactions called the
A. CAM cycle. B. citric acid cycle. C. carbon cycle. D. Calvin cycle. E. Krebs cycle.
Assuming the plant survives, predict what would occur if you removed the shoot apical meristem of a plant embryo.
A. The plant would grow two or more new shoot apical meristems. B. Growth would only occur at in the roots. C. The plant would mature, but only through vertical growth--no branches would form. D. The root apical meristem would take over the function of the shoot apical meristem.