The pelvis bone functions as an attachment point for legs. So, the pelvis bone found in dolphins is organ. Information about this organ tells us that

Explanation:

Answer 1 will be vestigial and answer 2 will be dolphins evolved from organisms with legs. Vestigial organs are those which are not in use but were once used by our ancestors for example an appendix

is this a psat question, if so do not cheat try your best.

i think it is dna, i'm not totally sure but i think it might be.