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6th Grade - Chapter 4 Vocabulary

Across
Practice of choosing plants and animals with desirable traits to reproduce
Structures that are similar in different species
The preserved remains or traces of an organism that lived in the distant past
The extinction of a huge number of species at about the same time
Down
The process by which the organisms that are best adapted to their environments survive and reproduce
A timeline covering millions of years and showing the major eras of Earth's distant past
The death or complete disappearance of a species