Three important characteristics such as a notochord, a dorsal hollow nerve cord, and pharyngeal gill slits, should appear at any stage of their life cycle. These are the characteristics of the chordates. Members of echinoderms share resemblance with chordates in presence of a notochord.
Cuticles antennae auditory ossicles are parts of arthropods bodies that allow them to breathe air
C. light-years is the best to describe the distance
36 thymine (matches with 36 adenine)
24 guanine (matches with 24 cytosine)
