Which one of the following indicates reptilian ancestry in birds?
Correct answer: B. Eggs with a calcareous shell
- A. Two special chambers crop and gizzard in their digestive tract
- B. Eggs with a calcareous shell
- C. Scales on their hind limbs
- D. Four chambered heart
Explanation
Yes, both birds and reptiles lay eggs with a calcareous (calcium carbonate) shell, which provides protection and allows for gas exchange during embryonic development.
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About Kingdom Animalia
Animals are multicellular, heterotrophic eukaryotes whose cells lack cell walls and chloroplasts, with specialised tissues in most groups. Coverage includes body symmetry, tissue layers, coelom, segmentation and levels of organisation, plus major phyla such as Porifera, Cnidaria, Platyhelminthes, Annelida, Arthropoda, Mollusca and Chordata.
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