Of the sites listed below, which is most likely to be free of any normal microbiota?
A. nasopharynx
B. uterus
C. vagina
D. large intestine
Answer: B
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All individuals of a particular species of whiptail lizards are females. Their reproductive efforts depend on _____
A) fertilization of their eggs by males of other lizard species B) gonadal structures that only undergo mitosis C) meiosis followed by a doubling of the chromosomes in eggs D) budding prior to the development of a sexual phenotype E) fragmentation via autolysis
Which changes would be expected to cause vasoconstriction in an arteriole?
A. decreases in carbon dioxide B. increases in lactic acid C. increases in potassium ion concentration D. decreases in pH
An earthworm detects sound
a. through specialized tympanic membranes located near the head. b. through a thinned region of the exoskeleton. c. through general mechanoreceptors on its skin. d. by using a specialized organ that measures the frequency of vibration of the surrounding dirt particles. e. through a series of mechanoreceptors arranged in a lateral line.
The extraembryonic membrane that is the first site of blood cell formation in mammals is the _____________
Fill in the blank(s) with the appropriate word(s)