Answer:
but I don't see a quest in this question
In biology, histones are highly alkaline proteins found in eukaryotic cell nuclei that package and order the DNA into structural units called nucleosomes. They are the chief protein components<span> of </span>chromatin<span>, acting as spools around which DNA winds, and playing a role in </span>gene regulation<span>.</span>
D. Electrons because isotopes deal with electrons.
Answer: after organelles it cells,tissues,organs,organ system then it give you the last one which is organism.
Explanation: