Choose the One Most Appropriate Letter for Each

Choose the one most appropriate letter for each.
-humans

A) ​cartilaginous skeleton; jaws
B) ​reptile with four-chambered heart
C) ​placental mammal
D) ​legless amphibian
E) ​invertebrate chordate; no metamorphosis
F) ​endotherm with feathers
G) ​limbless reptile
H) ​most primitive fishes with jaws; extinct
I) ​modern-day parasitic jawless vertebrate
J) ​marsupial
K) ​adult is called "sea squirt"
L) ​egg-laying mammal
M) ​swim bladder for buoyancy
N) ​may be sexually mature in larval form