Have you ever noticed what happens to ice cubes if you leave them out? The ice changes into a liquid. Or maybe you've noticed what happens to a pot of water being heated on a stove. The water changes into a gas. Water changes from one state to another as it is heated or cooled. Can you describe a time when you observed water changing from one state to another?

Explanation:You could say when I Freeze a water bottle because before u put the water bottle in the freezer it is a liquid and once u put the water bottle in the freezer it turns into a solid.

Hope this helps

the scientific method.

in 1859, charles darwin set out his theory of evolution by natural selection as an explanation for adaptation and speciation. he defined natural selection as the "principle by which each slight variation [of a trait], if useful, is preserved".