The Olmecs practiced basic agriculture using the "slash-and-burn" technique, in which overgrown plots of land are burned: this clears them for planting and the ashes act as fertilizer. They planted many of the same crops seen in the region today, such as squash, beans, manioc, sweet potatoes, and tomatoes.
The basic form for a book citation is: Last Name, First Name. Title of Book. City of Publication, Publisher, Publication Date.
An independent clause have a subject and a verb and Independent clause expresses as a complete thought that can stands alone as a coherent sentence. A dependent clause does not express a complete thought and because of that, It can't be called as a sentence.
