This printable crossword puzzle on the topic of Ecology & Evolution has 10 clues. Answers range from 7 to 18 letters long. This crossword is also available to download as a Microsoft Word document or a PDF.
Charles Darwin's famous book
A mechanism that prevents fertilization from occurring
The preserved remains of plants and animals
The process by which living things change over time
The diagram showing the relationship between a number of species
A reduction to the size of a population due to an extreme event
A mechanism that prevents viable or fertile offspring
Organisms of one species that live in the same place at the same time
The branch of science concerned with the classification of organisms
The formation of a new and distinct species in the course of evolution