The endosymbiotic theory says that precursor eukaryotic cells acquired cilia by endosymbiosis with a(n) ________ ancestor and others gained photosynthetic ability from endosymbiosis with a(n) ________ ancestor.
A. helminth, algal
B. spiral, cyanobacterial
C. protozoan, algal
D. archaeal, cyanobacterial
Answer: B
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While lancelets, members of the lineage ____, live mostly buried in the sand in warm, shallow marine habitats, they
do have well-developed segmented muscles and can move.
a. Petromyzontoidea b. Placodermi c. Cephalochordata d. Urochordata e. Myxinoidea
Modern oceanography and marine biology were attributed to:
a. the voyage of the Beagle. b. the discoveries of Alvin. c. the laying of the transatlantic telegraph cable. d. expeditions of Alexander Agassiz. e. the Challenger expedition.
Species richness is greatest at which latitude?
a. 60 degrees north b. 60 degrees south c. 0 degrees d. 40 degrees north e. 20 degrees south
Blood poisoning (septicemia) is typically treated with transfusions
Indicate whether the statement is true or false