The history of life ceases to be hypothesis and inference and becomes direct knowledge when fossils are available.
Life: An Introduction to Biology, Chapter 29 (p. 756), Harcourt, Brace & World, Inc. 1965
The history of life ceases to be hypothesis and inference and becomes direct knowledge when fossils are available.
Life: An Introduction to Biology, Chapter 29 (p. 756), Harcourt, Brace & World, Inc. 1965