Diatoms are characterized by ____, and are the source of economically useful_____
a. calcium carbonate shells; ozone
b. calcium carbonate sheaths; petroleum
c. silica shells; diatomaceous earth
d. silica sheaths; limestone
e. silica carbonate shells; diatomaceous earth
ANSWER: c
You might also like to view...
The leading strand is the daughter strand that has its ____ end pointed toward the replication fork and is therefore synthesized ______
A. 3'; in a series of segments B. 3'; continuously C. 5'; in a series of segments D. 5'; continuously E. None of the answer options are correct.
The interaction of sympathetic and
parasympathetic systems is best described as a. antagonistic. b. cooperative. c. overriding. d. synergistic. e. ineffective.
If DNA replication rejoined the 2 parental strands, it would be termed:a
dispersive. b. gradient. c. semiconservative. d. parental. e. conservative.
Female blue-footed boobies of the Galápagos Islands will mate only after a specific courtship display on the part of the male. The male high-steps to advertise his bright blue feet
What mechanism describes why the females do not mate with other species of boobies? A) Temporal isolation B) Ecological isolation C) Geographic isolation D) Mechanical incompatibility E) Behavioral isolation