Water is a pure substance. which of the following is true about water? a chemical change is required to separate the elements present in it. a physical change is required to separate the elements present in it. it is made up of two compounds, each with a different set of atoms. it is made up of an element and a compound.

Which type of fossil does this image depict?

How does blood clotting prevent the entry of pathogens through cuts and wounds? answer asap,, this is due tomorrow. will mark as brainliest or whatever you call it : )

The famous scientist galileo galilei did several experiments with sloping planes, which he rolled metal balls down so that he could study motion. by changing the slope, he could study how the speed at which the ball rolled was affected. what was the independent variable in galileo's experiment? a. the speed of the ball b. the slope of the plane c. whether the ball moved d. what the ball was made of