Why do volcanoes occur most often near plate tectonics?

Many state and local authorities are making laws regarding recreation on lakes, rivers, and oceans to reduce water pollution. why would lawmakers need to consult with scientists before making these laws? a) to make scientists feel important b) so that the laws reduce pollution by a sufficient amount c) so that parks and lakefront facilities will still make large profits d) so that the public will believe that the laws are important to follow

What is the next step in muscle contraction after the actin changes shape? (apex)

Which part of the cell is affected by the movement of molecules through diffusion, osmosis and active transport?