Charles Darwin used ________ to illustrate the mechanisms of natural selection.
A. natural history
B. biology
C. evolution
D. artificial selection
Answer: D
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The single most important physical sign of primary syphilis is
A) the chancre. B) a skin rash. C) paralysis. D) an acute eye infection.
The first kind of leukocyte lured to the site of inflammation is the
A. neutrophil. B. monocyte. C. macrophage. D. basophil.
Consider the accompanying figure. Four of the following are true statements about the structure indicated by “D.”
Which statement is false? a. It first evolved in arthropods. b. It extends anteriorly into the head region. c. It provides support for muscle contraction. d. It is replaced in most adult vertebrates by the vertebral column. e. It is one of the four exclusive features of chordates.
Which extraembryonic membrane lies immediately beneath the shell of a reptile embryo?
A) Allantois B) Chorion C) Amnion D) Yolk sac E) Placenta