<span>Physical weathering is a term used in science that refers to the geological process of rocks breaking apart without changing their chemical composition. Over time, movements of the Earth and environment can break apart rock formations, causing physical weathering.</span>
Stem cells are what allow planaria to grow and regenerate as the stem cells can change into any of the cells that make up the planaria.
The electron model most likely describes the locations of electrons sin atom.
It's know as chemical equilibrium
Answer is B. The length of a day on mercury is much longer than Earth
