Why isn’t a bat a bird?

People who exercise for an hour may have lower cholesterol levels. is that a statement? a law? or a hypothesis?

The idea that all living things are made up of cells is considered scientific law. this means the idea is an emerging scientific idea that has a logical explanation. has been tested with similar results at least twice. is supported by scientific consensus and a large amount of evidence. has been rejected only once by the scientific community

Factors that can increase mutation rates a. high temps b. low temps c. food additives d. uv rays