In the figure, the decrease of herbs (grasses) and increase in mosses would suggest that the climate in Siberia has become in the past 10,000 years.
A. drier
B. wetter
C. hotter
D. more windy
B. wetter
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While the maximum number of electrons required to fill the outermost shell of an atom varies depending on the size of the atom, almost all of the smaller atoms (atomic numbers 2-20) are considered stable, and thus nonreactive, when they contain ________ electron(s) in the outermost shell.
A. 1 B. 8 C. 16 D. 2
Which of the following is not a level of organization in the vertebrate body?
A. Bones B. Organ systems C. Tissues D. Cells E. Organs
Several species of Plasmodium cause malaria in humans
Indicate whether the statement is true or false
Which disorder is more common among the babies of older mothers?
A) Turner syndrome B) Klinefelter syndrome C) Trisomy X D) XYY syndrome E) Down syndrome