Cell like this has just left the lungs. What colour will it be?

Within your blood, red blood cells have a specialized task. ... Your blood then transports carbon dioxide back to the lungs where you can ... They extend like tree branches into the lung.

Explanation:

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#CARRYONLEARNING

the principles and empirical processes of discovery and demonstration considered characteristic of or necessary for scientific investigation, generally involving the observation of phenomena, the formulation of a hypothesis concerning the phenomena, experimentation to test the hypothesis, and development of a conclusion that confirms, rejects, or modifies the hypothesis.