Trochophores, the free-swimming larvae of many mollusks, are propelled through the water by
A. flame cells.
B. nephridia.
C. cilia.
D. flagella.
E. the radula.
Answer: C
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Shallow seas covered much of the land during the:a
Silurian period. b. Precambrian period. c. Ordovician period. d. Triassic period. e. Oligocene epoch.
Alfalfa plants occur symbiotically with bacteria that can convert nitrogen gas to ammonium in a process called ________
A) nitrogen fixation B) fertilizers C) nitrification D) nitroprocessing
Which of the following molecules has an enzymatic site that splits ATP during muscle contraction?
a. troponin b. myosin c. actin d. inositol triphosphate e. tropomyosin
Which group in the peacock butterfly experiment had the highest survival rates?
A. Those with more nocturnal habits B. Those without spots and without hissing/clicking sounds C. Those without spots but with hissing/clicking sounds D. Those with spots and hissing/clicking sounds E. Those with the same flower habitat as the birds