Living things have certain life processes in common. There are seven things that they need to do to count as being alive. The phrase MRS GREN is a way to remember them. It can be easy to tell if something is living or not.
| M | Movement | All living things move, even plants |
| R | Respiration | Getting energy from food |
| S | Sensitivity | Detecting changes in the surroundings |
| G | Growth | All living things grow |
| R | Reproduction | Making more living things of the same type |
| E | Excretion | Getting rid of waste |
| N | Nutrition | Taking in and using food |
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