What is the main function for the cell part labeled x a, b,c or d?

During the process of two rails or sides break apart and attract new nucleotide bases to form a new and complete strand.

What are the fixed alleles in the human species? o a. the alleles that are on the most chromosomes b. the alleles that change most often 000 c. the alleles that no one has d. the alleles that everyone has

What kind of bond is created by the attraction between atomic particles of opposite charge? ionic bond hydrogen bond covalent bond nuclear bond