Final answer:
Class II DNA Transposons are primarily found in genomic sequences, moving through 'cut-and-paste' or replicative pathways without using an RNA intermediate, unlike Class I elements.
Step-by-step explanation:
Class II DNA Transposons are primarily found in the genomes of organisms, existing as a significant portion of mobile genetic elements. Transposons are sequences of DNA that can move to new positions within a genome, often contributing to genetic diversity and evolution. Class II elements, in particular, move via a "cut-and-paste" mechanism where the transposon excises itself from one location in the genome and integrates into another, or through a replicative pathway where a new copy of the transposon is created and inserted elsewhere while the original stays in place. Unlike Class I elements, which move through an RNA intermediate, Class II transposons do not contain terminal inverted repeats, and their movement does not involve an RNA intermediate.