Answer as soon as (50 points) (and brainliest) only answer if you know it - name the group of animals whose ancestors were related to the earliest chordates. - what are two ways that bony fishes differ from ancient jawless fishes? - how do nonvertebrate chordates differ from other chordates?

Group of animals whose ancestors were to the earliest chordates are Echinoderms.

The only difference is that they have a circular aperture mouth.

The only difference is that they lack backbones.

not necessarily. higher fitness requires the organism to be reproductive successful. for example, an organism at age 10 with 15 offspring is much more fit than an organism at age 15 with only 5 offspring.