blood that is short of oxygen is often coloured blue on diagrams. Which blood vessels should be coloured blue, those that carry blood to the lungs or those that carry it back to the heart?

the dna molecules have a negative charge because of the phosphate groups in their sugar-phosphate backbone, so they start moving through the matrix of the gel towards the positive pole. power is turned on and dna fragments migrate through gel (towards the positive electrode).

explanation:

you can have just about every answer you can think of

gag reflex, poor dentition, gum retraction

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