I am not an expert in blood but the reason why blood coagulates when dehyadred is because it dries up faster like a plants leaes when you don't water it.
What is meant by blood thickness? Do you mean blood clotting faster or slower as in necessary to prevent strokes and heart attacks? People take medicine to "thin" the blood which really only means that the blood does not form clots as easily. Or as in too much blood? The amount of red cells compared to just the liquid part of blood changes due to many different conditions. People with "thick" blood may have too much iron, may have emphasema, may have had their spleen removed, may be dehydrated. Does this help?
They have a heart. Pretty much like ours, but smaller and faster.
The person with the O negative blood has an anti-RH antibody in their blood which will make the O positive platelets received coagulate (neutralizing it since the body sees the antigen RH as a foreign substance) which can cause severe problems depending on how much O positive blood is received.
this happens because the heat of the human blood temperature will be attracted easier in warm water. But if they smell blood faster won't they swin faster in warmer water? No because cold water is much more of an ocean temperature water so sharks swim faster in cold water.
If a blood vessel ruptures, it has developed a leak. In an artery (going away from the heart) the blood will leak much faster than in a vein (going back to the heart).
No that is something that you need to leave to a professional. Take them to their primary care doctor for blood testing. It will be both faster and much safer.
Not a lot because they can get dehydrated and die.
drinking so much that you become dehydrated.
i guess injections since it gets into the blood stream much faster
If a blood vessel ruptures, it has developed a leak. In an artery (going away from the heart) the blood will leak much faster than in a vein (going back to the heart).
Well, the faster your blood flows, the more you will bleed while getting the tatoo. And a way to prevent your blood from flowing faster is to be calm and relaxed while you're getting the tatoo. Avoid doing physical exercises just before you go get your tatoo.
much much much faster