They are cold blooded
They respire both by Skin and lungs.
They lay eggs in water ; they have a 3 chambered heart.
A three-dimensional network consisting of extracellular macromolecules and minerals, such as collagen, enzymes, glycoproteins and hydroxyapatite that provide structural and biochemical support to surrounding cells.
It should be option C that is the closest thing that I can think of,...im sorry if it is wrong
I believe the answer would be B. someone correct me if I'm wrong.
The codon loop.............