The rigid layer of nonliving material that surrounds the cell of plants and other organisms is called the
, big test tommorow and i don't understand it, have to get a good grade on test!

Harvey mixes two liquids. which observation of the new mixture most likely indicates a precipitate is forming?

Joe shines white light into a bowl half full of water at an angle of incident of 27.5°. calculate the angle of refraction in the water given the indices of refraction for air and water are 1.00 and 1.36, respectively.

Which of the following are correct values for the ideal gas laws constant r