The animals (Kingdom Animalia) are mainly grouped under two categories:
Bilaterally symmetrical and radially symmetrical
Coelomate and acoelomate
Aquatic and terrestrial
Vertebrates and invertebrates
The correct option is D:
The animals (Kingdom Animalia) are mainly grouped under two categories
(a) bilaterally symmetrical and radially symmetrical
(b) coelomate and acoelomate
(c) aquatic and terrestrial
(d) vertebrates and invertebrates