"REPRODUCTIVE ISOLATION" needs to occur for speciation to happen.....
Answer:
Crossing over is a biological occurrence that happens during meiosis when the paired homologs, or chromosomes of the same type, are lined up. Hope this helps :)
Explanation:
What chart-
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Adenine will always trancribe to Uracil
Thymine will always transcribe to Adenine
Cytosine will always transcribe to Guanine
Guanine will always trancribe to Cytosine
Answer is CUCAAUGAU
