Question

why the blood of human is red in colour give scientific reason?

Answer 1

Answer:

iron are there

Explanation:

iron is the main cause

Answer 2

Answer:

Each hemoglobin protein is made up subunits called hemes, which are what give blood its red color. More specifically, the hemes can bind iron molecules, and these iron molecules bind oxygen. The blood cells are red because of the interaction between iron and oxygen.