I NEED HELP! Which river is the center of the largest river system in the Tropical North? A. Cauca
B. Guayas
C. Orinoco
D. Magdalena

Ineed with what i should write for my research paper. my topic is history of slavery. 1800 words. all i need is what to write in each paragraphs. like when the research paper has titles for each paragraph and it explains the tile in each paragraph. for example when did slaverh begin? why did it begin like an outline.

From 1990 to 2008, by what percent did the world’s most developed economies cut their greenhouse gas emissions?

What ideas, institution, and causes became the focal points of chinese and islamic resistance respectively to the west in the latter half of 19th century and the first decades of the 20th