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!

You have over 600 muscles in your body! Kids can try this muscle anatomy word search featuring 14 important muscles.

Did you know that invertebrates don't have backbones? Find out some different types of invertebrates with the clues in this crossword puzzle.

Use clues to fill in the boxes in this crossword puzzle, and learn more about freshwater fish along the way.

There are a lot of structures that make up a new plant, called a seedling. Your child will learn what they're called with this life science word search.

What's the animal that swims upstream? Help your child figure this out with this cold-blooded animal crossword puzzle worksheet.

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

Dinosaurs and other creatures don't exist anymore! Learn the names of some extinct animals, and look for them in this fun wordsearch puzzle.