Grandma and grandpa didn't always have gray hair. Find out about what gives our hair color and what makes our hair lose that color as we get older.

The next time your parents ask you to wash your hands before dinner, read this worksheet about Joseph Lister and take their advice!

Learn all about Alexander Fleming, the man who invented penicillin and the happy accident that brought him to it.

Are you aware of how many endangered species there are in the world? Use this trivia sheet to test your knowledge of some beautiful but endangered animals.

Here are listed a handful of natural resources, for kids to classify as renewable resources and nonrenewable resources.

Looking for a worksheet to help your kid with his knowledge of human biology? This printable will help him with the digestive system.

This worksheet will quiz your child on the different fields of study in science. What's the difference between a zoologist and a geologist? Find out here!

Looking for a fourth grade worksheet to help your kid with science? This printable will help with your child's botany vocabulary.

Looking for a worksheet to help your kid with science? This printable will help him with human anatomy and vocabulary.

Looking for a worksheet to help your child with science? This printable will help them with their biology vocabulary.

Challenge your child' memory skills with this colorful worksheet. This fun printable will help with memorization skills and spatial awareness.

Ecosystems are an important part of fourth grade science. This fun printable will help your child with her knowledge of plants and animals.

Looking for a fourth grade worksheet to help your kid with science? This printable will test his knowledge of the water cycle.

Fourth and fifth graders will cut out and assemble a human skeleton from paper in this engaging life sciences printable.

The insect order Hemiptera consists of True Bugs such as Stainers, Assassin Bugs, Leaf-Footed Bugs, and this Boxelder Bug.

These flash cards serve as an intro to life science, but also help with counting skills and sequential ordering.

Learn about the animal practice of hibernation in this quick science worksheet.

Help your child practice his science skills with this science worksheet, which will challenge his knowledge of reptiles and ask him to solve a puzzle!

Help your child learn about the nervous system and the digestive system with this fun worksheet, which will challenge his knowledge of physiology.

Children match animals to their ecosystems in this life sciences worksheet.

Test your third grader's biology knowledge with this worksheet, which challenges him to separate invertebrates from animals with a backbone.

Looking for a worksheet that will give your kid help with his life-science skills? This printable will challenge his knowledge of birds.

Does your child love dogs? Test his knowledge on the different breeds of dog with some trivia questions!

This science vocabulary activity is packed with basic science vocabulary words to help the youngest kids warm up to scientific concepts.

Learn about the many different biomes the Earth is home to in this life science worksheet, which holds the answers to some simple life science questions.

Learn more about two kinds of aquatic biomesÃfreshwater and saltwater biomesÃand how you can tell them apart.

Learn all about the ooey-gooey areas of land called wetlands that provide a home for certain kinds of plants and animals.

Learn more about what lives--and what thrives--in marshes with this fill-in-the-blank worksheet on marsh ecosystems.

Find out more about what REALLY dwells in swamp ecosystems with this worksheet all about swamps.

Learn more about the animals in the swamp food chain, and find out how each living thing in a swamp ecosystem needs another to survive.