Question

Skin : Keratin : : Blood : _______

Answer 1

$\huge\red{Hello Mate}$

$<b><u>The blank will be filled by haemoglobin.$

Answer 2

Hemoglobin.

Keratin is the primary protein of the skin and it helps to create the nails, hair, and the skin surface that we have.

It is a sort of barrier protection for the skin and provides the rigidity that the skin enjoys.

Similarly, hemoglobin is the primary constituent of blood.

It is a protein in red blood cells that carry oxygen throughout our body.

Therefore, it is the building block of blood.