1. book lungs
2. gills
3. lungs
4. Ctenidia
book lungs
1. aestivation
2. hibernation
3. migration
4. immigration
aestivation
1. starfish
2. brittle star
3. sea urchin
4. sand dollar
brittle star
1. Onychophora
2. Chelicerata
3. Arachnida
4. Crustacea
Chelicerata
1. ventral part of diencephalon
2. dorsal part of diencephalon
3. dorsal part of cerebellum
4. ventral part of cerebellum
dorsal part of diencephalon
1. dried shark skin
2. green coloured gland in shark
3. a fish meal
4. a gland found in amphibian
dried shark skin
1. shark
2. salmon
3. carp
4. ribbon fish
salmon
1. pH of water
2. food availability
3. salinity of water
4. thyroid hormone
thyroid hormone
1. Leydig cells
2. follicular cells
3. lungs
4. acinar cells
Leydig cells<br>
1. Acetylcholine
2. ATP
3. GTP
4. Phosphokinase
Acetylcholine