1. Maxillary palps
2. Epipharynx
3. Mandibles
4. Labrum
Mandibles
1. Frog
2. Rat
3. Camel
4. Rabbit
Frog
1. Trigeminal nerve
2. Vagus nerve
3. Pathetic nerve
4. Auditory nerve
Auditory nerve
1. thyroxin
2. calcitonin
3. oxytocin
4. secretin
thyroxin
1. birds and mammals
2. reptiles and birds
3. reptiles and mammals
4. fishes and amphibian
fishes and amphibian
1. Rhocophorus
2. Bufo
3. Phyllobates
4. Necturus
Rhocophorus
1. testosterone
2. progesterone
3. oestrogen
4. corticosterone
testosterone
1. Enhydrina
2. Typhlops
3. Python
4. Eryx
Enhydrina
1. Amphicoelous
2. Acoelous
3. Heterocoelous
4. Procoelous
Procoelous
1. Parazoa
2. Protozoa
3. Eumetazoa
4. Deuterostomia
Parazoa