1. WHAT IS TONICITY
  2. WHAT IS BLOOD
  3. WHAT IS TRI LED TETRA OXIDE ALSO KNOWN AS AND WHY 

1. Tonicity is the property of a solution that depends on the concentration of solute particles across the membrane of a cell.

2. Blood is a fluid present in animals and it helps in transportation of oxygen and various nutrients to various parts of the body and it also carries waste products along with it.

3.  Trilead tetraoxide is also known as red lead because it is used to make a reddish brown paint to paint and prevent rusting. 

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