Crocodiles and penguins are similar to whales and dogfish in which one of the following features?
Possess a solid single stranded central nervous system
Lay eggs and guard them till they hatch
Possess bony skeleton
Have gill slits at some stage
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Which among the following adaptations is not common to polar bears, penguins, seals and whales?
If a crocodile has a four chambered heart, this is it not considered a mammal similar to dolphins and whales or platypuses and echidna? Is it because they don't have mammary glands ? Do whales and dolphins have mammary glands if no why are they mammals?
PS- sorry for grouped questions but these are very closely related...
Do humans have Gill slits in embryonic stage? If they have Gill slits what does it become in adults?
Whales and dolphins like fishes live in water. But they do not have gills. How do they breathe?