A) Annelida
B) cnidarians
D) Sponge
A) Penta-radial symmetry, Hydrocoele
B) Bilateral symmetry, Hydrocoele
C) Bilateral symmetry, enterocoele
D) Penta-radial symmetry, enterocoele
A) They have setae
B) They have a trochophore larva
C) Neither group has lungs
A) At high altitudes the air sacs do not function
B) There is little oxygen in the atmosphere at high altitudes
C) At high altitudes birds flap their wings faster
D) There is little carbon dioxide at high altitudes