In medusae, mesoglea comprises the bulk of the animal and forms a resilient skeleton. In polyps, the water-filled coelenteron acts as a hydrostatic skeleton, which, in concert with the mesoglea, maintains the form of these animals. Muscles in cnidarians are extensions of the bases of ectodermal and endodermal cells.
The answer is the first E. Hope this helps! :D
Correct me if I'm wrong but I believe it is the Gravity (or Gravitational Pull) from the Sun.
Tiger frogs have similarities in their mitochondrial DNA that are not shared by other frog species
