One important characteristic shared by all embryos of land vertebraes and aquatic vertebrates is that?

Explanation:

The characteristics shared by all vertebrates (both land and aquatic) is that their embryos develop in watery environment.

Vertebrates are included in the phylum Chordata and all the vertebrates share some common key characteristics at some point in their lifetime. The notochord, present in all embryonic and some adult chordates and it give skeletal support to the chordates.