Science ? Please help!?

Question

How can color and shape be useful in examining and identifying physical evidence? I need 1 example of color and shape then explain how its useful in examining and identifying a piece of physical evidence for instance blood and glass. Can you describe both for me? I desperately need help! It's due today. I will give 5 stars and 10+ points to the first good answer! I greatly appreciate your help! Thank you.

Answer 1

When you suffer from a lack of oxygen, the color of blood seems darker. It is also the case for venous blood which seems dark. In contrast oxy hemoglobin seems more bright as is arterial blood rich in oxygen.

Answer 2

dunno