A chemical indicator is a substance that changes color when you an acid to it. it is used to test the acidity in water, soil, etc.
i havent learned how it works yet , but ill try to figure it out for you
<span>All cells have a plasma membrane, ribosomes, cytoplasm, and DNA and sometimes or very rare occasions in the cell wall</span>
Hi!!
Gravitational force is always an attractive force.
The answer would be fluid permeability!
Answer: food enters the human body through the mouth and leaves the digestive system.
