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Little biologists will use this respiratory system diagram to identify the most important parts of the human respiratory system and their functions.

Test your knowledge of prehistoric animals with this life sciences crossword puzzle!

Do you know the functions of the primary organs in the human body? Put your knowledge to the test with this fourth- and fifth-grade crossword!

Find out more about single-cell organisms with this coloring page and diagram.

Take a peek into a temperate forest ecosystem with this food web worksheet for fourth and fifth graders!