They are now separated by a(n)_ that they could not have crossed. Their locations
could be explained if South America and Africa at the time the plants and
animals lived.
were_at the time plants and animals lived

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:

sex cells are usually half's then they find another half and make a fertilize egg

answerdendrites; blank(2) axons;