As part of the Columbian Exchange, which of the following agricultural products, common in Americas today, was actually transported over from Europe?
a. onions
b. melons
c. lettuce
d. soybeans
e. all of these agricultural products were brought over from Europe
E
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Gas bladders help seaweeds: a. hold tight to the seafloor
b. keep their upper portions near the surface. c. photosynthesize nutrients. d. reproduce.
In which of the following l°Cations is a rotor cloud most likely observed?
A. in absolutely unstable air B. in the middle of a cumulonimbus C. on top of a developing cumulus cloud D. beneath a lenticular cloud
According to the flood frequency curve, what is the return interval for a flood the magnitude of the spring 1997 flood?
What will be an ideal response?
Why was the Clean Air Act amended in 1990?
A. to reduce sulfur dioxide emissions from electric power plants to half of 1980 levels B. so flat fees for excessive pollution could be determined by the federal government C. to reduce sulfur dioxide emission through command-and-control regulations D. to reduce sulfur dioxide emissions from electric power plants to half of 1970 levels