Here is a picture that outlines the parts of a tree:

The pronunciation of scientific words is important and difficult.  Here are two articles that outline basics of how to pronunciate greek words.  Most scientic words are greek.  The first one is easier than the second one.  Good luck.  If you have any questions, just ask me!!

http://www.elasmo-research.org/education/classification/pronunciation.htm

http://www.malawicichlidhomepage.com/aquainfo/greek_pronounce.html

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