What is the main difference between heterochromatin and euchromatin?

Heterochromatin is associated with histone acetylation, while euchromatin is associated with DNA methylation.

Heterochromatin is found only in prokaryotes, while euchromatin is found only in eukaryotes.

Heterochromatin is densely packed and transcriptionally inactive, while euchromatin is loosely packed and transcriptionally active.

Heterochromatin contains only non-coding DNA, whereas euchromatin contains coding DNA.