Factors involved in soil formation include ________
A) nitrogen-fixing bacteria and grazing by herbivores
B) weathering of parent material and the addition of organic material
C) erosion, level terrain, and the absence of rooted vegetation
D) tropical climate, acid precipitation, and frequent wildfires
E) seasonal changes in the tides
B
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Regularly-sized waves with long, rounded crests are known as ____________________
Fill in the blank(s) with correct word
Which of the following is the conjugate acid of water?
A) HCl B) H3O+ C) NH4+ D) OH-
The gases oxygen and carbon dioxide move in and out of cells through
A. diffusion. B. facilitated diffusion. C. active transport. D. endocytosis.
In the Midwest, record-setting cold temperatures often result when a(n) ____ air mass invades the region
a. mP b. cP c. cA d. mT