If you are asking why do you become red when you overwork, then the answer is in the blood cells. The more you circulate your blood as when you work out, the hotter you get. Your blood needs to cool and will tend to do so in places in which the veins and arteries are closest to the skin....they do this to cool the blood.
They are not. When I have been swimming, they become pale.
it will become a red giant in 4.5 billion years
Because they always have been red.
Philippine Red Cross's motto is 'Always First. Always Ready. Always There.'.
not always mammals have red bugs have green orange and yellow
No
It is the mass of the main sequence star. "High mass" stars can become supergiants (not always red). If you go into more details, you will find this answer is a simplification, but it's OK for most purposes.
Not exactly. Red giants become white dwarf stars. It is the red supergiants that can become supernovas.
It was always red it was built from red sandstone.
They're not always red...
I Have Become What I've Always Hated was created in 2003.
Red foxes are always reddish in colour.