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Where did cinnamon originate from?

If you were to describe how a typical green roof was layered starting at the roof and heading upward, which order below would be correct?

Which part of the pepper plant do we get the spice, black pepper, from?

Which empire, through tight control or even closure of certain maritime routes in the 1450s, ultimately encouraged Portuguese and other explorers to begin looking for maritime routes around Africa a few decades later? 

Why were cottonwood trees a good choice as a phytoremediation plant for cleaning up trichloroethylene (TCE)?

Which plant do you see in the image below that we harvest one of our key spices from?

Where did the black pepper plant originate?

What is the main way that green roofs can help a home or building owner gain back their initial $ investment?

25.  When an HFr donor passes a portion of its chromosome into an F- recipient, a recombinant F+ cell results.

37.  What is the difference between a disinfectant and an Antiseptic?