In the Linnaean system, birds and reptiles are each dassified in a separate class. However, in the modern system, birds are members of the

clade Reptilia. Which conclusion, based on evidence, did scientists cite to revise the classification of birds?

A

Birds and reptiles have adaptations for surviving in similar habitats

B. Birds and reptiles both rely on DNA, RNA and the universal genetic code

C. Birds and reptiles share many behavioral traits, such as laying eggs in nests.

D

. Birds descended from the most recent common ancestor of reptiles.

The answer is D. Birds descended from the most recent common ancestor of reptiles.

Explanation:

Linnaean Classification:

The Linnaean classification system classified organisms on the basis of similarities in their characteristics, not their ancestry. Therefore, according to this system, birds and reptiles were classed separately because reptiles are cold blooded and possess scales whereas, birds are warm blooded and have feathers.

Phylogenetic Classification:

The modern phylogenetic classification classifies organisms solely on the basis of ancestry. According to this system, birds are most closely related to reptiles than to any other organisms.

Reptiles evolved around 300 million years ago. Around 160 million years later, the dinosaurs evolved. Around 65 million years ago, all dinosaurs were killed off in a mass extinction event except a group of feathered dinosaurs that later evolved into modern birds.