There is an enzyme that catalyzes the production of the pigment responsible for dark fur color in siamese cats and himalayan rabbits. this enzyme is thermolabile, meaning that it does not function at higher temperatures. rabbits raised at 5 c are all black. if raised at 20 c,

well we can't tell you because we cant see the time give a screen shot or something.

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blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart. as the ventricle contracts, blood leaves the heart through the pulmonic valve, into the pulmonary artery and to the lungs where it is oxygenated.