Question

Which are the classes of vertebrates​which lay eggs with shells.

Answer 1

Most arthropods, vertebrates (excludingmammals), and mollusks lay eggs, although some, such as scorpions do not. Reptile eggs, bird eggs, and monotreme eggs are laid out of water, and are surrounded by a protective shell, either flexible or inflexible.

Answer 2

lay eggs with shells.
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→ These are first vertebrates fully adopted for life on dry land.

→ Some of them live in water, but they return to the land for breeding.

→ Pair of limbs are present in them.

→ Mouth is large and usually contains teeth in both hand.

→ Respiration occurs by gills.

→ Heart is incompletely 4 chambered having auricles and partially divided ventricle.

→ Ex :- Lizard, Turtles, Snakes, Alligators etc.

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→ This class includes all birds.

→ Pair of limbs are present in them. Forelimbs are modified into wings for flight.

→ Mouth has a wide gap. Jaws are covered with horny sheaths to form strong beak.

→ Respiration takes place by lungs.

→ Heart is relatively large and fast beating for quick supply of accurate amount of blood during flight. Heart is 4 chambered having two auricles and two ventricles.

→ Ex :- Ostrich, Peacock, Pigeon, Crow etc.

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