Ripping up a piece of paper is physical change or chemical change?

In which state was more than 100 billion tons of coal mined in 2005?

What's wrong with this ecological pyramid? (multiple choice)1. secondary consumers should be at the bottom of the pyramid2. the sun has an arrow leading to decomposers 3. primary consumers should come after the sun4. energy retained should increase from the bottom to the top5. the sun should be at the bottom of the pyramid

Which hormone is used by both males and female?