Concept: Life began in water, so the earliest organisms evolved from an aquatic habitat.
Explanation: The first living things appeared in the ancient oceans.
They were simple aquatic organisms before any land life existed.
Evidence from evolution shows that fish, which live in water, came before amphibians, reptiles, birds, and mammals.
Amphibians, for instance, evolved from lobe-finned fish and were among the first vertebrates to live on land, but they still had to return to water to reproduce.
This shows that the original habitat of the first organism was water.
Answer: C. aquatic