Infection of the respiratory system by ________ may develop into symptoms of a common cold
A) adenoviruses
B) cytomegaloviruses
C) papillomaviruses
D) polyomaviruses
E) parvoviruses
A
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Most members of this lineage of Cnidarians have both polyp and medusa stages in their life cycles,
with the polyp stage typically forming a colony. Species of Obelia are members of this lineage.
a. Hydrozoa b. Scyphozoa c. Trematoda d. Cubozoa e. Anthozoa
Which of the following did not occur during Precambrian time?
A. ancestors of all modern animals appeared B. O2 accumulated in Earth's atmosphere C. eukaryotes arose D. photosynthesis evolved E. life originated
The Alu family is an example of
A) short interspersed repeat elements. B) intermediate repeat elements. C) long interspersed repeat elements. D) terminal sequences. E) gene-flanking sequences.
According to the fossil record, which of the following jawed fishes diversified in the Devonian and Carboniferous periods, but left no direct descendants?
a. placoderms b. ostracoderms c. osteolepiforms d. conodonts