Question

what is the work of RBC

Answer 1

It carries haemoglobin and respiratory gasses.

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Answer 2

RBC: Red Blood Cells

Hemoglobin is the protein inside red blood cells that carries oxygen.  

Red blood cells also remove carbon dioxide from your body, transporting it to the lungs for you to exhale. Red blood cells are made inside your bones, in the bone marrow.

more info -

Another one is

WBC: White Blood Cells

It's functions -

1. Provide immunity

2. Fights against diseases

3. Produces antibodies and remembers the diseases too