The fossil record shows that the jawed fishes called ____ diversified in the Devonian and
Carboniferous periods, but they left no direct descendants. Their heads were covered with large, heavy
plates of bone, and their jaws had sharp cutting edges.
a. acanthodians
b. conodonts
c. osteolepiforms
d. placoderms
e. ostracoderms
D
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Identify several ways in which the study of hemoglobin variants led to an understanding of the molecular relationship
among genes, proteins, and human disease. What will be an ideal response?
Special-interest groups are not permitted to post information as science on the Internet unless it has undergone peer review
Indicate whether the statement is true or false
A homozygous recessive where "A" represents the trait has two recessive alleles symbolized by __________.
Fill in the blank(s) with the appropriate word(s).
Agar is a complex polysaccharide that comes from a/an
A. green plant. B. fungus. C. mold. D. algae. E. euglena.