In various parts of the world, soil phosphorus is associated with which of the following environmental problems?
A) soil degradation because of depletion of soil phosphorus
B) eutrophication of lakes because of a build-up of soil P in the watersheds
C) toxic levels of phosphate in groundwater supplies
D) both A and B
E) all of the above
D
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________ occurs when pollen from the same plant fertilizes the female egg cell.
Fill in the blank(s) with the appropriate word(s).
What was responsible for the violence in "Bleeding Kansas"? Why might the violence be viewed as a "prelude to Civil War"?
What will be an ideal response?
The time frame during which domestication of plants occurred was toward the end of the Ice Age
Indicate whether the statement is true or false
Flowering intervals are controlled to a large degree by the length of ____ periods
Fill in the blank(s) with correct word