An echinoderm's endoskeleton is comprised of ossicles
Indicate whether the statement is true or false
true
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A newly discovered microorganism has a circular chromosome that is complexed with histones, but not enclosed within a membrane. The plasma membrane lipids include glycerol dietethers and diglycerol tetraethers. There are no mitochondria or chloroplasts, but the cells do contain 70s ribosomes. This microbe most likely is
A. a protozoan. B. an archaeon. C. a fungus. D. a bacterium.
Demographics include __________ and __________ structure, such as the size of the __________
base. Fill in the blank(s) with the appropriate word(s).
The letter “D” in the above figure represents
a. nerve cords. b. ganglion. c. brain. d. branching nerves. e. none of these.
Which class includes octopuses, squids, and nautiluses?
a. Polyplacophora b. Cephalopoda c. Bivalvia d. Gastropoda