Answer: when it envolves the world
Explanation: if it has anything to do with the world observations are better than experimenting and much safer.
Answer: Osmosis
Explanation:
"Water makes up a large percentage of the body's cells. For a cell to remain in homeostasis, there must be a mechanism to control water changes in the cells. The movement of water from an area of high water concentration to an area of low water concentration is osmosis." Source, Quizlet. https://quizlet.com/350562884/cell-homeostasis-flash-cards/
It can be observed and tested