Simmental cattle
These cows are red and white. They live in many places. They give us milk. They also give us meat. This helps many people. Do you like milk?
Early Reader · Change the reading level on the articleLife Science articles — Page 102
Read about living things, from cells and plants to animals and the human body. Choose an article below; its reading controls let you move between the available levels.
5,533 public articles · Page 102 of 116
Explore related Science Lab activities about plants, animals and ecosystems or the human body, each at five reading levels.
Simosuchus
This was a small crocodile. It had a very short nose. It did not eat meat. It ate plants for food instead. It lived a long time ago. Can you imagine a pug-nosed crocodile?
Early Reader · Change the reading level on the articleSimple eye in invertebrates
Some bugs have tiny eyes. These are called little eyes. They help bugs see light. They also help bugs fly well. This helps them stay safe. Can you find a bug with little eyes?
Early Reader · Change the reading level on the articleSiphonophore
Some sea animals are like many small parts joined together. These parts work as one big group. Some parts help them swim. Some parts help them eat. They live in the deep blue sea. It is a busy place! Do you like the…
Early Reader · Change the reading level on the articleSipuncula
These are peanut worms. They live in the sea. They hide in sand and mud. They eat tiny bits of food. They can pull their heads inside. It looks like a little peanut. Do you like the ocean?
Early Reader · Change the reading level on the articleSirenidae
Sirens are special water animals. They look like long eels. They have two tiny arms. They do not have back legs. They eat worms and plants. They live in warm water. Can you find a siren?
Early Reader · Change the reading level on the articleSivapithecus
Long ago, there lived an ape. It lived in a warm place. It was like an orangutan. It ate seeds and grass. This ape is very old. We find its bones in the dirt. Do you like old bones?
Early Reader · Change the reading level on the articleSivatherium
A big animal lived long ago. It was like a giant giraffe. It had large horns on its head. It was very strong and heavy. We find its bones in the ground. Can you imagine seeing one?
Early Reader · Change the reading level on the articleSkin care
Your skin is very big. It covers your whole body. It keeps you safe from germs. You can wash it with water. You can use lotion to stay soft. Do you wash your skin every day?
Early Reader · Change the reading level on the articleSkin grafting
Doctors can move skin to fix a wound. They take skin from a healthy spot. Then they put it on the hurt spot. This helps the body heal. It helps you look better too. Have you ever had a scrape?
Early Reader · Change the reading level on the articleSkin infection
Tiny germs can get on your skin. They can make your skin red. It might feel sore or itchy. This can happen to people and animals. We must keep our skin healthy. Have you ever had a red spot?
Early Reader · Change the reading level on the articleSkua
The skua is a big bird. It lives by the sea. These birds like to hunt for food. They can even take food from other birds! They are very strong fliers. Do you like to watch birds?
Early Reader · Change the reading level on the articleSkull fracture
The bones in your head are hard. They keep your brain safe. Sometimes a hard hit can break a bone. This is called a break. A doctor can help fix it. Have you ever bumped your head?
Early Reader · Change the reading level on the articleSled dog
Sled dogs pull heavy sleds. They run on cold snow. They help people move things. They can even carry mail. They are very strong. Do you like dogs?
Early Reader · Change the reading level on the articleSleep apnea
Some people have trouble breathing at night. Their breath may stop for a little bit. This can make them feel very tired. It might make them snore loudly. It is good to talk to a doctor. Do you sleep well at night?
Early Reader · Change the reading level on the articleSleep deprivation
Your body needs sleep to stay well. Sleep helps your brain work. It helps your heart stay strong too. Not sleeping enough can make you feel bad. It might make you feel sad or mad. Do you get enough sleep at night?
Early Reader · Change the reading level on the articleSleep disorder
Some people have trouble sleeping. They may find it hard to fall asleep. They might also wake up too much. This can make them feel bad. Sleep helps our bodies stay well. Do you sleep well at night?
Early Reader · Change the reading level on the articleSleep in animals
Most animals need to sleep. It helps them feel rested. Some sleep at night. Some sleep during the day. Even bugs need rest. Do you like to sleep?
Early Reader · Change the reading level on the articleSleepwalking
Some people walk while they sleep. They may sit up or talk. Their eyes stay open. They do not know they are awake. Most people do not remember it. It is very strange! Have you ever seen this?
Early Reader · Change the reading level on the articleSlimehead
Some fish live in the deep sea. They have big eyes. They can be bright red. These fish live for a long time. They stay near the bottom. Do you like red fish?
Early Reader · Change the reading level on the articleSling (medicine)
A sling helps a hurt arm. It is made of soft cloth. It holds your arm close to your body. This helps your arm stay still. It helps you heal fast. It feels good to rest. Do you have a soft cloth sling?
Early Reader · Change the reading level on the articleSlipper lobster
The slipper lobster lives in warm seas. It has wide plates on its head. These look like flat slippers. They hide in the sand to stay safe. We can eat them for food. Do you like seafood?
Early Reader · Change the reading level on the articleSloth bear
The sloth bear is a black bear. It lives in the forest. It likes to eat ants. It uses its long lip to suck them up. It has long, shaggy hair. It is a very cool bear! Do you like bears?
Early Reader · Change the reading level on the articleSlug
A slug is a small animal. It does not have a hard shell. It moves on a flat foot. The slug makes wet slime to help it slide. Slugs like to eat plants and mushrooms. They like to stay in damp places. Do you see a slug…
Early Reader · Change the reading level on the articleSmile
A smile is a happy face. You move the muscles by your mouth. It shows you feel joy. It can help you make friends. It is a kind way to say hello. Do you like to smile?
Early Reader · Change the reading level on the articleSmilodon
A big cat lived long ago. It had very long teeth. These teeth look like knives. It was a strong hunter. It lived in the Americas. Can you see its big teeth?
Early Reader · Change the reading level on the articleSmooth-coated otter
This is a smooth otter. It lives near fresh water. It has short brown fur. It eats fish for food. It can swim very well. Do you like otters?
Early Reader · Change the reading level on the articleSmooth muscle
Some muscles work all on their own. They are inside your body. They help your tummy work. They also help your eyes see. These muscles help you stay healthy. Do you feel them moving inside you?
Early Reader · Change the reading level on the articleSnail
A snail is a small animal. It has a hard shell. The shell is its home. It can hide inside. Snails move very slow. They like to eat plants. Do you like to move slow too?
Early Reader · Change the reading level on the articleSnakebite
A snake can bite you. It might use its sharp teeth. Some snakes have bad spit. This spit can make you feel sick. It can make your skin red. It is good to stay away. Do you like snakes?
Early Reader · Change the reading level on the articleSnakefly
A snakefly is a long bug. It has a long neck. It has two big wings. This bug eats other small bugs. It helps us by eating pests. Can you find one in a tree?
Early Reader · Change the reading level on the articleSneeze
A sneeze is a big burst of air. It comes from your nose and mouth. It helps clean your nose. It can happen if the air is cold. You can cover your mouth with your arm. This helps keep others safe. Have you ever had a…
Early Reader · Change the reading level on the articleSnipe
The snipe is a bird. It has a long beak. It looks for food in the mud. This bird hides in wet grass. It is hard to see. Do you like to look for birds?
Early Reader · Change the reading level on the articleSnipe eel
The snipe eel is a thin fish. It lives in the deep ocean. Its mouth looks like a bird beak. This helps it catch food. It is a very cool fish. Do you like the deep sea?
Early Reader · Change the reading level on the articleSnout
A snout is part of an animal face. It has a nose and a mouth. Some animals have long snouts. Others have short ones. They help animals smell things. It is a neat part of their head! Do you have a snout?
Early Reader · Change the reading level on the articleSnow goose
The snow goose is a bird. It can be white or gray. These birds live in the cold north. They fly to warm places in winter. They make loud sounds. Do you like to watch birds?
Early Reader · Change the reading level on the articleSnow pea
You can eat the whole snow pea. The pod is flat and thin. It is not thick like other peas. You eat the seeds and the pod. They are good to eat. Do you like peas?
Early Reader · Change the reading level on the articleSnowshoe hare
The snowshoe hare is a small animal. It has very big feet. These feet help it walk on snow. Its fur turns white in winter. This helps it hide in the snow. Do you like to play in the snow?
Early Reader · Change the reading level on the articleSnowy owl
The snowy owl is a big white owl. It lives in the cold Arctic. Most of its feathers are white. This helps it hide in the snow. It has bright yellow eyes. Do you like white owls?
Early Reader · Change the reading level on the articleSocial comparison theory
We look at others to learn. We see how we do. We look at friends to check. This helps us know ourselves. It can change our mood. Do you look at others?
Early Reader · Change the reading level on the articleSocial rejection
Sometimes people leave us out. They might ignore us. This can feel very sad. We all need friends to be happy. It is okay to ask for help. Have you ever felt left out?
Early Reader · Change the reading level on the articleSole (fish)
A sole is a flat fish. It lives in the sea. Some look like a shoe. This fish lives on the bottom. It is fun to learn about fish. Do you like to see fish in the sea?
Early Reader · Change the reading level on the articleSolenodon
The solenodon is a small animal. It lives in the woods. It likes to eat bugs. It has a very long nose. This nose helps it find food. Can you find a bug in your yard?
Early Reader · Change the reading level on the articleSolifugae
Some bugs live in dry sand. They are called sun spiders. They like to hide from the sun. They hunt for small bugs to eat. They have big jaws for food. Do you like looking at bugs?
Early Reader · Change the reading level on the articleSolo Man
Long ago, people lived in a new place. They lived by a big river. They used stones to make tools. They lived with big animals like tigers. They are very old. We found their bones in the dirt. Can you find a bone in…
Early Reader · Change the reading level on the articleSomali cat
The Somali is a soft cat. It has very long hair. This cat looks like a little fox. It likes to play with you. We think they are very sweet. Do you like cats?
Early Reader · Change the reading level on the articleSomatic cell
Small parts make up your body. They make your skin and bones. They make your blood, too. These parts help you grow. They are in you right now. Do you have many parts?
Early Reader · Change the reading level on the articleSomatic cell nuclear transfer
Scientists can make a twin cell. They take a tiny part from a body cell. They put it into an egg. This helps make new cells. These cells can help sick people. It is very neat! Do you like science?
Early Reader · Change the reading level on the article