Question

what is #2 labeled as? (hint: its a copy of a strand)
dna
nucleus
mrna
trna

Explanation:

The hint says it's a copy of a strand, and in the context of DNA transcription, mRNA (messenger RNA) is a copy of a DNA strand. The options include mRNA, and the description matches mRNA's role as a copy of a DNA segment for protein synthesis.

Answer:

mRNA