Which occurs during transcription? a-dna is copied to create a second dna strand. b-mrna codons and trna anticodons assemble amino acids. c-dna is unzipped with the aid of dna polymerase. d-mrna is synthesized from a strand of dna.

D.  mRNA is synthesized from a strand of DNA.

Transcription, hence the root script, means to write. This is the creation of the mRNA "messenger" information.

not necessarily. higher fitness requires the organism to be reproductive successful. for example, an organism at age 10 with 15 offspring is much more fit than an organism at age 15 with only 5 offspring.