what does EBV cause?
What will be an ideal response?
mononucleosis
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Which of the following vertebral curvatures is convex anteriorly?
A) cervical B) sacral C) thoracic D) lumbar E) both cervical and lumbar
Which of the following is true about the fetal stage of development?
A) The organ systems initially form, and then grow. B) The head is disproportionately small at the beginning of the stage. C) It comes after the embryonic period. D) It consists of the first three months of the pregnancy.
In systematics, a group of organisms consisting of a common ancestor and some, but not all, of its descendents is defined as a
A. None of the answer choices is correct. B. clade. C. polyphyletic group. D. cladogram. E. paraphyletic group.
The bright coloration of male birds is often the result of
A) gene flow. B) genetic drift. C) sexual selection. D) stabilizing selection. E) coevolution.