Question

Why is the human blood red? And is there other creatures that have different coloured blood? If so, then why?

Answer 1

Answer:

It is red due to Haemoglobin

arthropods have colourless blood cause they don't have such pigment

Answer 2

Answer:

Blood in the human body is red regardless of how oxygen-rich it is, but the shade of red may vary. The level or amount of oxygen in the blood determines the hue of red. As blood leaves the heart and is oxygen-rich, it is bright red. When the blood returns to the heart, it has less oxygen.

Explanation:

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