What is the function of a muscle to the structure of the skin

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

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.

Which is abiotic? a. tree sap b. insect c. sunlight d. wood table