Which technology was first established by Cro-Magnon?
Select one:
a. throwing spears
b. scrapers
c. controlled fire
d. group life
e. All of the answer choices are correct.
a. throwing spears
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A motor unit is _____
a. a muscle and the bone it moves b. two muscles that work in opposition c. the amount a muscle shortens during contraction d. a motor neuron and the muscle fibers it controls
Amniocentesis involves sampling
a. the embryo at the eight cell stage. b. fetal cells in the amniotic fluid. c. sperm or egg cells. d. fetal skin tissue. e. placental cells
Some marine species of cyanobacteria ________.
A. do not have flagella but are, nonetheless, motile by some unknown mechanism B. do not have flagella but are motile by means of pseudopods C. do not have flagella and are, therefore, nonmotile D. have flagella and are, therefore, motile
Please choose the class of chemical agents to which quaternary ammonium compounds belong.
A) Detergents B) Oxidizing agents C) Halogens D) Phenolics E) Aldehydes