Some athletes have as little as 3.0% body fat. if such a person has a body mass of 69kg. how many pounds of body fat does that person have?

Which of the following is an example of physical change not a chemical change? a) a log gives off heat and light as it burns. b) a tree stores energy from the sun in its fruit. c) a penny lost in the grass slowly changes color. d) a water pipe freezes and cracks on a cold night.