Question

Which of the following best describes early mammals?

Options

• Small, shrew-like, viviparous, and comparatively intelligent

• Thick-shelled, reptilian, and cold-blooded

• Large, egg-laying, and slow-moving

• Aquatic, jawless, and simple-celled

Answer 1

Early mammals were small, shrew-like forms that were viviparous and comparatively more intelligent than reptiles. These characteristics helped them adapt successfully after the decline of reptiles, ultimately allowing them to become the dominant life forms on Earth.