The ultimate source of all new alleles is
A) mutation.
B) chromosomal duplication.
C) genetic drift.
D) natural selection.
Answer: A
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A. true B. false
The interlocking rib cage of Titaalik roseae suggests that this transition organism had lungs, which of the following traits were also found in T. roseae but not in the ancestral form?
A. An upright stance. B. Wings. C. Primitive wrist and five finger-like bones. D. Live young. E. Articulating hip bones.
Why are living organisms such an important component of soil? What will be an ideal response?
Some complex viruses have icosahedral symmetry in the head region and helical symmetry in the tail. Overall, these viruses are said to have ________ symmetry.
A. radial B. binal C. complex D. bilateral