Why is it hard to breath when we run or doing heavy activities



The red color of blood comes from the protein hemoglobin, while ripe strawberries, red apples and reddish autumn leaves are colored by anthocyanins. Red pigment made from ochre was one of the first colors used in prehistoric art.


The order in which colors are named worldwide appears to be due to how eyes work, suggest computer simulations with virtual people. These findings suggest that wavelengths of color that are easier to see also get names earlier in the evolution of a culture.

Hey ;)Hope this helps...
Base on oed it is b
b. final
Because our body works hard to send more oxygen to our muscles 

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