Given a scientific question and its correct answer, generate supporting facts for the answer. This supporting fact can be an explanation for the answer to the given question.

Q: Question: Human evolution shows that evolutionary changes typically occur at what pace? Answer: slow

A: Usually evolutionary changes occur at a very slow pace. Human evolution took millions of years. However, sometimes evolution can also happen quite quickly.
****
Q: Question: What two gases are the main components of air? Answer: nitrogen and oxygen

A: A: Other examples of liquid mixtures include salt water and salad dressing. Air is a mixture of gases, mainly nitrogen and oxygen. The rock pictured in the Figure below is a solid mixture.
****
Q: Question: What gives the body shape and support? Answer: skeleon

A:
The skeleton supports the body and gives it shape. It has several other functions as well, including:.
****