Why is melting a physical property of the wax, but flammability is a chemical property?

Several kinds of bears are found on earth. most bears are brown or black, but one type of bear, the polar bear, is white. what process led to this difference in fur color? explain your answer.

How hot is the suns corona? (integrated science)

Calculate the number of kilojoules to warm 125 g of iron from 23.5°c to 78.0°c.