Red river hog
This pig has red hair. It lives in the forest. It likes to be near water. It eats roots and fruit. It is a pretty animal. Can you see its white stripe?
Early Reader · Change the reading level on the articleLife Science articles — Page 96
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 96 of 116
Explore related Science Lab activities about plants, animals and ecosystems or the human body, each at five reading levels.
Red squirrel
The red squirrel is a small animal. It lives in many trees. It likes to eat seeds and nuts. This food helps it grow. It has a long tail to help it jump. Can you see its red fur?
Early Reader · Change the reading level on the articleReduction (orthopedic procedure)
Sometimes a bone can break. It might move out of place. A doctor can help fix it. They move the bone back. This helps the bone heal. It is good to feel better. Do you know where your bones are?
Early Reader · Change the reading level on the articleReduviidae
Some bugs are called assassin bugs. They hunt other bugs for food. They have a long mouth to help them eat. These bugs can be bright colors. They help us by eating pests. Do you like bugs?
Early Reader · Change the reading level on the articleRed wolf
The red wolf is a special animal. It lives in the woods. It has reddish fur. People help keep them safe. We want them to stay in the wild. Do you like wolves?
Early Reader · Change the reading level on the articleReedfish
The reedfish looks like a long snake. It lives in warm water. It can breathe air like we do. This helps it live in dark water. It is a very cool fish. Do you want to see it swim?
Early Reader · Change the reading level on the articleReef lobster
Small lobsters live in the sea. They are bright red and orange. They hide in dark caves all day. They like to stay safe and quiet. We can see them in fish tanks. Do you like bright colors?
Early Reader · Change the reading level on the articleReflex hammer
Doctors use a small tool. It is a little hammer. They tap your leg with it. This helps them check your body. It shows how your nerves work. It is a helpful tool. Have you ever seen one?
Early Reader · Change the reading level on the articleRefractive error
Sometimes things look blurry. This can happen to your eyes. Light does not land right. It might be too far or too close. Glasses can help you see. Do you wear glasses?
Early Reader · Change the reading level on the articleRegulation of gene expression
Our bodies have tiny plans. These plans tell cells what to do. They help us grow and stay well. Cells use these plans when they need them. This helps us change with the world. Do you wonder how your cells work?
Early Reader · Change the reading level on the articleRegurgitation (digestion)
Some animals bring food back up. Parents do this to feed babies. It helps them carry food home. Some animals chew it again to help it digest. It is a way to eat. Can you imagine doing that?
Early Reader · Change the reading level on the articleRemingtonocetidae
These were old sea animals. They had long heads. They could swim and walk. They lived in the water. They look very cool! Can you swim like them?
Early Reader · Change the reading level on the articleRemorse
Sometimes we feel sad about a mistake. You might feel bad if you hurt a friend. You can say you are sorry. This helps to fix things. It is good to be kind. Have you ever said you were sorry?
Early Reader · Change the reading level on the articleRené Antoine Ferchault de Réaumur
A man named Réaumur loved bugs. He studied them for a long time. He also made a way to measure heat. This helps us know if it is hot. He was a very smart man. Do you like to look at bugs?
Early Reader · Change the reading level on the articleRené Laennec
René was a kind doctor. He made a tool to hear hearts. It was a tube made of wood. This tool helps doctors listen. It helps people stay well. Do you want to hear a heartbeat?
Early Reader · Change the reading level on the articleRepenomamus
A long time ago, a small mammal lived. It was shaped like a badger. It even ate dinosaurs! This animal was very brave. We found its bones in China. Can you imagine a mammal eating a dinosaur?
Early Reader · Change the reading level on the articleRepetitive strain injury
Doing the same move too much can hurt. It can make your hands ache. Your arms might feel weak. This can happen at work. It can also happen when you play. Rest helps your body feel better. Do you move your hands a lot?
Early Reader · Change the reading level on the articleReplication crisis
Scientists try to find new things. They do tests to learn. Sometimes, other people do the same test. They do not get the same answer. This can be a big problem. We must check our work. Do you like to solve puzzles?
Early Reader · Change the reading level on the articleReptiliomorpha
Some old animals looked like reptiles. They lived a long time ago. Some lived in the water. Some lived on the land. They are like our cousins. We are part of this big family too! Can you find them in the picture?
Early Reader · Change the reading level on the articleRequiem shark
These sharks live in warm seas. They swim very fast. Some sharks hunt in packs. They eat many things. This helps them stay strong. Do you like sharks?
Early Reader · Change the reading level on the articleResentment
You might feel bad when things are unfair. This feeling is called bitterness. It can feel like being mad and sad. It happens when someone is mean. This feeling can stay for a long time. It is okay to talk about it.…
Early Reader · Change the reading level on the articleResin
Some plants make a thick liquid. It can be hard like a rock. It helps the plant stay safe. It can even stop bugs. People use it for glue and smells. Do you like the smell of trees?
Early Reader · Change the reading level on the articleRespiratory disease
Sometimes our lungs get sick. This can make it hard to breathe. You might have a cough. It might feel hard to get air. This helps us stay healthy. We must take care of our bodies. Do you feel good today?
Early Reader · Change the reading level on the articleRespiratory sounds
Air makes sounds when you breathe. You can hear it. It can be soft. It can be loud. Sometimes it sounds like a whistle. We use a tool to hear it well. Can you hear your breath?
Early Reader · Change the reading level on the articleRespiratory tract infection
Sometimes we get sick in our airways. It can make us cough. It might make our nose run. This can happen in our nose or lungs. We want to feel well again. Do you feel better after a rest?
Early Reader · Change the reading level on the articleRetainer (orthodontics)
A retainer helps your teeth stay straight. It can be clear plastic or wire. You wear it after your teeth are fixed. It keeps them in the right spot. It is very helpful! Do you have a bright smile?
Early Reader · Change the reading level on the articleReticulated giraffe
This is a big giraffe. It has red spots. The spots look like blocks. It is the tallest land animal. It lives in Africa. We can see them in zoos. Do you like giraffes?
Early Reader · Change the reading level on the articleReticulated python
This is a very long snake. It lives in warm jungles. It has pretty patterns on its skin. This helps it hide in the leaves. It is a great swimmer, too. Do you like snakes?
Early Reader · Change the reading level on the articleRetina
A thin layer sits inside your eye. It catches the light you see. This helps you see colors and shapes. It sends these ideas to your brain. It is like a camera inside you. Can you see the world around you?
Early Reader · Change the reading level on the articleRetractor (medicine)
Doctors use a special tool. It helps them see inside. The tool moves skin away. This lets the doctor work. It helps keep things open. It is a very helpful tool. Do you see how it works?
Early Reader · Change the reading level on the articleRetriever
A retriever is a special dog. They find things for people. They carry things in their mouths. They are very gentle and kind. These dogs love to help us. Do you like dogs?
Early Reader · Change the reading level on the articleReverse genetics
Scientists study how life works. They change tiny parts of a living thing. This helps them see what happens. It helps them make new medicine. This is very smart work. Do you want to learn more?
Early Reader · Change the reading level on the articleReverse transcriptase
Some tiny germs use a special tool. This tool turns air into food. It helps the germs grow and stay. It is very busy inside them. We study it to stay healthy. Can you find it under a lens?
Early Reader · Change the reading level on the articleReverse zoonosis
Sometimes, bugs can carry germs. A bug might bite a person. Then the bug bites an animal. Now the animal can get sick. This can happen with many bugs. It is a way germs move. Can you think of a bug?
Early Reader · Change the reading level on the articleRex rabbit
The Rex is a special rabbit. Its fur feels soft like velvet. It came from France a long time ago. Some people keep them as pets. They are very cute to see. Do you like soft animals?
Early Reader · Change the reading level on the articleReynoutria japonica
This plant is called knotweed. It has hollow stems. It can grow in cracks. It can grow through roads. This plant is very strong. It grows where it wants. Can you find it?
Early Reader · Change the reading level on the articleRhamphorhynchus
This was a flying creature. It had a very long tail. It used its sharp teeth to eat fish. It lived a long time ago. We can find its bones in the ground. Do you like flying animals?
Early Reader · Change the reading level on the articleRhaphidophoridae
These bugs are called cave crickets. They live in dark places. They have very long legs. They also have long feelers. They jump to stay safe. They are not scary to us. Do you like bugs?
Early Reader · Change the reading level on the articleRh blood group system
Your blood has tiny parts on it. Some people have these parts. Some people do not. This is called being positive or negative. It helps doctors keep you safe. Do you know your blood type?
Early Reader · Change the reading level on the articleRheumatic fever
A sore throat can make you sick. It can hurt your joints. It can even hurt your heart. This happens if you do not take medicine. Doctors can help you feel better. Do you stay healthy?
Early Reader · Change the reading level on the articleRheumatoid arthritis
Some people have sore joints. Their joints feel warm and puffy. This can happen in the hands. It can make moving hard. Doctors help people feel better. Do you move your hands often?
Early Reader · Change the reading level on the articleRheumatology
Some people have pain in their bones. This pain can be in joints too. Special doctors help them feel better. They use tools to help the body. They help us move and play. Do you like to move and play?
Early Reader · Change the reading level on the articleRhinocerotoidea
Some big animals lived long ago. They are like the rhinos we see now. Some were very, very large. They lived on the land. These animals are very interesting. Do you like big animals?
Early Reader · Change the reading level on the articleRhinorrhea
Sometimes your nose gets runny. This can happen when you are sick. It can also happen when you cry. It might even happen in the cold. Your body does this to help you. Do you have a runny nose today?
Early Reader · Change the reading level on the articleRhizobia
Tiny living things live in the dirt. They go into plant roots. They make food for the plant. This helps beans and peas grow big. It is a great team. Do you like beans?
Early Reader · Change the reading level on the articleRhizopus
Some tiny things grow on food. They live on bread and fruit. They can even live in soil. Some help make food for us. They are very small. Can you find them? Look closely at your food.
Early Reader · Change the reading level on the articleRhode Island Red
This is a red chicken. It lives on a farm. It can lay brown eggs. These birds have red feathers. They are very special to us. Do you like eggs?
Early Reader · Change the reading level on the articleRhynchocinetidae
Some tiny shrimp are red and white. They have a beak that can move. This helps them hide in small cracks. They stay safe from big fish. It is fun to see them! Do you like red and white colors?
Early Reader · Change the reading level on the article