Question

The idea of common descent came to Darwin by his observations on ______.

Options

• geographic distribution of species

• comparative embryology

• phylogenetic structures

• blood groups of animals

Answer 1

The idea of common descent came to Darwin by his observations on geographic distribution of species.

Explanation:

Darwin’s idea of common descent was largely inspired by his observations of the geographic distribution of species, particularly on the Galapagos Islands. He noted that species in different geographic regions showed adaptations to their specific environments, suggesting that diverse species evolved from a common ancestor. This geographic pattern of species distribution provided strong evidence for evolution through common descent.