Coenzymes are derivatives of
A. minerals.
B. proteins.
C. lipids.
D. vitamins.
D
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Radiometric dating
a. is based on the premise that each isotope decays at a constant rate. b. is unpredictable because changes in temperature and pressure alter the results. c. can be used to date sedimentary rock. d. has a large error factor. e. is used for dating only recent fossils.
The distinctive mating signals that have evolved as part of an animal's courtship illustrate what type of reproductive
isolating mechanism? a. gametic isolation
b. temporal isolation c. behavioral isolation d. mechanical isolation e. communicative isolation
Specialized parenchyma cells, known as ________ cells, occur along with sieve-tube members.
Fill in the blank(s) with the appropriate word(s).
Solid worms that lack a body cavity are known as
A. coelomates. B. pseudocoelomates. C. triploblastic. D. acoelomates. E. diploblastic.