Trophic pyramids typically have a ____ base and a ____ top portion
a. narrow; narrow
b. narrow; wide
c. wide; narrow
d. wide; wide
e. flat; flat
C
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Most Swiss starlings produce four to five eggs in each clutch. Starlings producing fewer or more than this have reduced fitness. Which of the following terms best describes this situation?
A) artificial selection B) directional selection C) stabilizing selection D) disruptive selection E) sexual selection
Which of the following is a water-soluble vitamin?
a. vitamin A b. B-complex vitamins c. vitamin D d. vitamin K e. vitamin E
An animal without a vertebral column has an unprotected notochord
Indicate whether the statement is true or false
Exposing E. coli to calcium ions and DNA, then incubating the culture at low temperatures followed by heat shocking
induces ____.
a. artificial transformation b. a double crossover c. a single crossover d. DNA replication e. infection