Which of the following is an accurate definition of the theory of evolution ?

you weren't very specific, but its the process by which organisms change over time as a result of changes in heritable physical or behavioral traits. hope this helped <3

Since you didn’t list the options, I’ll just give you a basic overview, then you can choose the one that fits the best.

Evolution has two primary mechanisms: mutation and natural selection. Mutation causes small variations in an organisms DNA, which can be helpful or hurtful to the organism. Natural selection is the process by which helpful mutations spread through the population because they help the organism survive, and detrimental mutations are removed from the population because they often die before reproducing. Hope this helps!

step 1: initiation

initiation is the beginning of transcription. it occurs when the enzyme rna polymerase binds to a region of a gene called the promoter. this signals the dna to unwind so the enzyme can ‘‘read’’ the bases in one of the dna strands. the enzyme is now ready to make a strand of mrna with a complementary sequence of bases.

step 2: elongation

elongation is the addition of nucleotides to the mrna strand. rna polymerase reads the unwound dna strand and builds the mrna molecule, using complementary base pairs. there is a brief time during this process when the newly formed rna is bound to the unwound dna. during this process, an adenine (a) in the dna binds to an uracil (u) in the rna.

step 3: termination

termination is the ending of transcription, and occurs when rna polymerase crosses a stop (termination) sequence in the gene. the mrna strand is complete, and it detaches from dna.