Which event is an important factor in increasing variety among sexually reproducing organisms?

How does secondary succession differ from primary succession?

What could happen if two base pairs on a strand of dna or switched

Mrna: gcuaauguc what amino acids does the mrna above code for? what type of amino acids or function are uag, uga, and uaa coding for? which codon (3 letters) signals translation to start and also codes for the amino acid methionine (met)?