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

Break down a word to create new ones with this fun worksheet for second through fifth graders!

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

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!

Which comes first, genus or phylum? To complete this life science crossword, kids need to put the 9 levels of biological classification in the correct order.