How does the amount of dark matter in the Universe compare to the amount of ordinary matter? In what way is dark matter similar to ordinary matter? In what way are they different?

I got the first one which dark matter is 23% of the universe. But for the other questions, the textbook doesn't mention the comparisons.

2 answers

Some of what you want can be found here.
http://science.howstuffworks.com/dictionary/astronomy-terms/dark-matter-dark-energy.htm
anyone have it for cpa?