This printable crossword puzzle on the topic of Ecology & Evolution has 13 clues. Answers range from 4 to 22 letters long. This crossword is also available to download as a Microsoft Word document or a PDF.
an animal, plant or life form
a group of animals that can reproduce
the differences between animals
anything that is caused by the environment
a difference that is inherited
putting animals into different groups
there are five of these in classification
a skeleton on the outside of your body
an animal that lives in the sea
a frog or toad
an animal with feathers and lays eggs
an animal with scales and lays eggs
mammal