How much do you know(1)

I know that.
1.Which grows the fastest?
A:A bamboo plant is the fastest.Some can grow one meter a day.

2.Which is the most intelligent?
A:A monkey is the most intelligent.One monkey learned over 1000 words.

3.Which river is longer?
A:The Nile is longer.It's 6,650 kilometers long.

4.Where is the highest waterfall?
A:Angel Falls is the highest waterfall.It's in South America. It's 980 meters.