Learn all about your body's most important muscle: your heart! This simple diagram is a great way to introduce your little biologist to his heart.

Introduce your child to the building blocks of life: DNA! This coloring page features a double helix structure, or a DNA strand.

Children learn about the food cycle in a rain forest as they color in a scene of snakes, butterflies, leopards, and other forest-dwelling creatures.

How cool are chromosomes? Read what Steve the savvy scientist has to say about chromosomes and genes before testing your knowledge with some fill-in-the-blanks.

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

This Awesome Anatomy coloring page is all about the human eye, and makes a handy study tool as well!

Got a little animal lover on your hands? Let him spend some time with his furry friends with this fun animal crossword puzzle.

Which of these animals does not belong? Explore the plants and animals of the desert, and choose which ones are in their right habitat.

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.

Learn about the integumentary system, which is really just a fancy phrase for "skin", in this worksheet.

The brain is the most important organ in the human body. Get a basic grasp on the parts and functions of the brain with this anatomy info sheet.

All living things go through cycles. Learn about the life cycle of an amphibian with this diagram of the life of a frog!

Studying human anatomy? Here is a great sheet that shows a diagram of all the muscle system. Your child will learn the scientific terms of the major muscles.

All kids love animals, but how much does your child know about them? Kids will get to learn some animal vocabulary with this wild crossword puzzle.

This beginners worksheet will help your child get all their ducks in a row when it comes to understanding animals that hatch from eggs.

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.

Ever wonder how the human body functions? Enjoy this great info sheet all about the human heart, one of our most important organs.

It's never too early to start teaching your kid about eating right and staying active.

Help your child understand pollination with this informative worksheet, complete with a diagram.

Expand your sea creature vocabulary with this Life in the Reef worksheet!

What are the different types of animal body coverings? Help kids sort and categorize these animals based on their body coverings.

What happens to our food after we swallow it? Chomp on some body science with this diagram of the digestive system.

Explore the circle of life with this informative coloring sheet! Help your student color and learn the names of each stage of a dogâs life.

These worksheets help kids understand food webs, an important part of the life science curriculum in fourth grade.

Studying the human body? Get to know your body inside and out with this muscle diagram.

Learn more about the skin (and the science behind pimples -- ew!) in this printable life science diagram.