Final answer:
Chromosomes include all the other structures listed, including DNA molecules, histones, and nucleosomes.
Step-by-step explanation:
Chromosomes include all the other structures listed. Chromosomes are the most condensed form of chromatin and are made up of DNA molecules, histones, and nucleosomes. The DNA molecules are wrapped around histones to form nucleosomes, which are then further organized and compacted into chromosomes. So, chromosomes encompass all the other structures listed in the question.