Which two characteristics do all animals have? They are symmetrical and heterotrophic.
They are heterotrophs and have a backbone.
Their cells have a nucleus and membrane-bound organelles.
They have a backbone, and their cells have membrane-bound organelles

1. b.

2. d.

3. a.

5. d.

6. c.

these are the only ones that i know, i hope this , and good luck.

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: