The blood vessels of the umbilical cord are derived from which one of the following structures?
A) allantois
B) chorion
C) embryonic disk
D) amnion
E) yolk sac
A
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Which of the following taxa are extant (have at least some members that are still living; opposite of extinct)?
A. Ornithischia B. Lepidosauria C. Saurischia D. theropods E. ichythosaurs
Each skeletal muscle cell constitutes a single
A. motor unit. B. muscle fiber. C. sarcolemma. D. myofibril. E. sarcomere.
Processed pseudogenes are useful for testing Darwin's theory of descent with modification because they ________
A) can be utilized for examining phylogenetic relationships among asexually reproducing organisms B) demonstrate phylogenetic relationships of divergence because they do not accumulate mutations C) accumulate mutations at a constant rate, and thus older processed pseudogenes should be shared by a greater variety of species D) are distributed in organisms that are found in similar environments
A collection of birth defects caused by alcohol consumption during pregnancy is known as ____________________. Fill in the blank(s) with the appropriate word(s)