Explain cation exchange
What will be an ideal response?
Answer: Cations are positively charged ions of the soil. They act as nutrients in the soil. The ability of the colloids in the soil to attach to these cations for subsequent use for plants is highly variable by soil type and its measurement is a way to numerically define soil fertility.
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Drawing the boundaries of voting districts so that one group has an unfair advantage is
A) apportionment. B) a census. C) gerrymandering. D) a technique used throughout Europe.
Signed in 1648, the ________ ________ ________ set the boundaries among the nation-states of early modern Europe
Fill in the blank(s) with correct word
At a height of 10 miles, what is the density of the atmosphere when compared to sea level? [INSERT FIGURE 1-10. NO CAPTION]
A) 1% B) 10% C) 50% D) 90%
Individuals, not populations, evolve to become genetically different.
Answer the following statement true (T) or false (F)