Members of this lineage of flatworms are endoparasites of vertebrates. Some, called blood flukes,
cause an often deadly disease in humans called schistosomiasis.
a. Trematoda
b. Turbellaria
c. Polychaeta
d. Cestoda
e. Hirudinea
A
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Research indicates that compared to the genomes of bony fish, the elephant shark genome contains ____ the genes
necessary for bone formation.
a. none of b. half of c. most of d. all but one of e. double
An example of passive parental care is ____
a. nutrients that cross the placenta b. nursing c. nurturing
d. the nest environment e. protection from predators
In amphibians, the gray crescent appears
a. after the egg matures. b. after fertilization. c. during blastula formation. d. following gastrulation. e. as a result of tissue specialization
Four of the five processes listed below are involved
in gene action. Select the exception. a. replication b. transcription c. translation d. polymerization e. polysome activity