How are stem cells important in planaria?

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 answer is magnitude measures the effects of an earthquake on the area , while the intensity measures the strength of an earthquake.

The answer is atmosphere. there are four spheres of the earth: 1. geosphere (from greek word 'geo' = ground), 2. hydrosphere (from greek word 'hydro' = water), 3. biosphere (from greek word 'bio' = life), and 4. atmosphere (from greek word 'atmo' = air). a magnetosphere is a region of space around astronomical objects controlled by the magnetic field of that object. through the process of elimination, since lightning is present in the air, it can be found in the atmosphere.