A(n) ________ is a permeable underground layer of rock, sand, and gravel saturated with groundwater.
A. natural spring
B. aquifer
C. hot spring
D. submergence
B. aquifer
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A ______________ group consists of the most recent common ancestor and some of its descendants.
Fill in the blank(s) with the appropriate word(s).
Nondisjunction involving the X chromosomes may occur during oogenesis and produce two kinds of
eggs. If normal sperm fertilize these two types, which of the following pairs of genotypes are possible? a. XX and XY b. XXY and XO c. XYY and XO d. XYY and YO e. XY and XO
Which of these statements can be logically inferred from the amount of DNA shared by chimpanzees and humans?
A) Humans and chimpanzees share a relatively recent common ancestor. B) Humans evolved from chimpanzees. C) Humans are unique and different from all other life forms. D) Humans are a more complex life form than chimpanzees.
Which species of Staphylococcus is one of the most important human pathogens?
A. Staphylococcus luteus B. Staphylococcus aureus C. Staphylococcus mucilaginosus D. Staphylococcus intermedius