What process makes diversity possible

Which of the following was not a major animal on land during the carboniferous period? amphibians insects both a and b none of the above

Some substances but not other can cross the (blank) membrane of a cell

The scales shown in the introduction measure mass, or the amount of matter in a particular object. the scientific law of conservation of mass states that matter cannot be created or destroyed during a chemical reaction, but it can change from one form to another. did the simulation support this scientific law? explain why or why not.