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In male cartilaginous fishes, the pelvic fins bear structures called __________ which aid in internal fertilisation.
The class of fishes that includes both marine and freshwater species with a bony endoskeleton is __________.
In bony fishes, the gills are covered by a bony flap called the __________.
The __________ in bony fishes regulates buoyancy.
The name Amphibia signifies their ability to live in both __________ and __________ habitats.
In amphibians, the alimentary canal, urinary tract, and reproductive tract open into a common chamber called the __________.
The heart of amphibians is __________-chambered.
The limbless amphibians, such as *Ichthyophis*, are also known as __________.
The name Reptilia refers to their mode of locomotion, which is __________.
The body of reptiles is covered with dry, cornified skin and epidermal scales or __________.