Cells work to keep a balance of water, pHtemperature, and glucose concentration at all times. This is an example of

that is wrong, its not thymus.

here is the answer

water, ice, acids, salts, plants, animals, and changes in temperature are all agents of weathering. weathering is the breaking down or dissolving of rocks and minerals on earths surface. once a rock has been broken down, a process called erosion transports the bits of rock and minerals away.