To detect the presence of certain elements, primarily metal irons based of each elements characteristics emission spectrum
Force = mass x acceleration
Unit of force = kg . m/s²
GPE = Force×Height
Unit of GPE = kg.m/s² . m = kg.m²/s² = Joule
Answer:
B
Explanation:
The reaction will occur naturally
Cells are surrounded by #2 , Cell membrane and Cell wall thats what protects the cell