Crocus
The crocus is a small flower. It can be purple or yellow. Some grow in the spring. Some grow in the fall. They can make a spice for food. Do you like colorful flowers?
Early Reader · Change the reading level on the articleLife Science articles — Page 50
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 50 of 116
Explore related Science Lab activities about plants, animals and ecosystems or the human body, each at five reading levels.
Crohn's disease
Some people have a sick tummy. It can hurt a lot. It can make you go to the bathroom many times. It may make you feel very tired too. Doctors help people feel better. Does your tummy feel okay today?
Early Reader · Change the reading level on the articleCrossbill
This bird has a funny beak. The tips cross over each other. It uses this beak to get seeds from cones. This helps the bird eat well. It is a very special bird. Do you like birds?
Early Reader · Change the reading level on the articleCross River gorilla
These are very rare gorillas. They live in high hills. They like to eat fruit and bark. We must help keep their woods safe. They are very special to us. Do you like big apes?
Early Reader · Change the reading level on the articleCroup
A germ can make you sick. It can make your throat swell. This makes a loud bark cough. It may feel worse at night. You can rest at home. Do you feel better soon?
Early Reader · Change the reading level on the articleCrown (dental restoration)
A crown is like a hat for a tooth. It covers a tooth that is broken. It can make a tooth look good. It helps your tooth stay strong. It is a very helpful tool. Do you have a bright smile?
Early Reader · Change the reading level on the articleCrowned pigeon
These are big birds. They live on far islands. They eat fruit and seeds on the ground. They can live for a long time. They are very pretty to see. Do you like big birds?
Early Reader · Change the reading level on the articleCrown group
Scientists use a special group to study life. This group includes all living animals. It also includes their old relatives. This helps us see how things change. It is like a family tree. Can you find your own family…
Early Reader · Change the reading level on the articleCrown-of-thorns starfish
This is a big starfish. It lives in the sea. It has many sharp spines. These look like thorns. It eats coral in the ocean. It is very colorful. Do you like starfish?
Early Reader · Change the reading level on the articleCrutch
A crutch helps you walk. It holds your weight. You use your arms to move. It helps if your leg is hurt. This makes moving easier for us. Do you see them at the doctor?
Early Reader · Change the reading level on the articleCryptoclidus
A long sea reptile lived long ago. It swam in the deep water. It ate small fish and soft animals. Its teeth helped it catch food. We can find its bones in the ground. Do you like sea animals?
Early Reader · Change the reading level on the articleCryptomeria
The Sugi is a very big tree. It stays green all year. It grows in Japan. The wood smells very good. People use it to make boxes. It is a special tree. Do you like trees?
Early Reader · Change the reading level on the articleCryptopidae
Some bugs look like centipedes. They have many legs. They have 21 pairs of legs. These bugs cannot see. They live in many places. It is fun to look for them. Can you find a bug?
Early Reader · Change the reading level on the articleCtenophora
Comb jellies live in the sea. They look like soft jelly. They have tiny hairs to swim. These hairs look like little combs. They help them move in the water. They catch food to eat. Do you like the sea?
Early Reader · Change the reading level on the articleCT scan
A CT scan takes pictures of your body. It looks inside you. It can see your bones and heart. This helps doctors keep you well. It is a very smart tool. Do you want to see inside?
Early Reader · Change the reading level on the articleCuckoo bee
Some bees are called cuckoo bees. They do not make their own nests. They lay eggs in other bees' homes. The new baby bee eats the food there. This is a sneaky way to live. Do you think they are clever?
Early Reader · Change the reading level on the articleCuckoo-roller
This is a special bird. It lives in the green woods. Some are grey and some are brown. They eat bugs for food. It is fun to watch them. Can you see the bird?
Early Reader · Change the reading level on the articleCucumis metuliferus
This fruit has spikes like horns. It grows on a vine. The skin is bright orange. Inside, the soft part is green. It can help people find water. It is a tasty snack. Do you like fruit with spikes?
Early Reader · Change the reading level on the articleCulcita (echinoderm)
These are special sea stars. They look like soft pillows. They live in warm ocean water. They eat small things on the sea floor. You can see them on coral reefs. They are very neat to see. Do you like sea stars?
Early Reader · Change the reading level on the articleCulex
Some mosquitoes are called Culex. They live all over the world. They lay eggs in small pools of water. These bugs can carry germs. This matters for our health. Do you see them in your yard?
Early Reader · Change the reading level on the articleCumacea
Small sea bugs live in the sand. They look like tiny shrimp. They eat tiny bits of food. Fish like to eat them too. This helps many sea animals. Do you like the sea?
Early Reader · Change the reading level on the articleCupressaceae
Some trees are part of a big family. They can be very tall. Some are the tallest in the world! They grow in many places. These trees are very special. Do you like trees?
Early Reader · Change the reading level on the articleCupressus sempervirens
This is a tall green tree. It stays green all year. It can live for a long time. Some are very old! It grows in hot places. Do you like tall trees?
Early Reader · Change the reading level on the articleCurassow
The curassow is a big bird. It lives in warm, leafy woods. These birds can be very large. They are part of a big bird family. We can see them in South America. They are very cool to see! Have you seen a big bird?
Early Reader · Change the reading level on the articleCurculionidae
These bugs have long noses. They live on plants. Some eat nuts and fruit. They do not hurt people. They can even play dead. Do you like bugs?
Early Reader · Change the reading level on the articleCurlew
The curlew is a bird. It has a long, curved beak. This beak helps it find worms in the mud. It has brown feathers. These birds live in many places. Can you see a bird like this?
Early Reader · Change the reading level on the articleCurry tree
The curry tree is a special plant. It has green leaves. People use the leaves in food. They make many tasty meals. The leaves smell very good. Do you like tasty food?
Early Reader · Change the reading level on the articleCusk-eel
The cusk-eel is a long fish. It looks like a snake. It lives in the deep, blue sea. It likes to hide in the mud. This fish helps us learn about the ocean. Do you like fish?
Early Reader · Change the reading level on the articleCutibacterium acnes
Tiny living things live on your skin. They eat oil from your skin. Sometimes they grow too fast. This can cause spots called acne. These spots can be red. Do you know about these tiny things?
Early Reader · Change the reading level on the articleCuttlefish
Cuttlefish live in the sea. They have eight arms. They also have two long arms to grab food. They can hide in the sand. They are very smart animals. Do you like the ocean?
Early Reader · Change the reading level on the articleCuvier's dwarf caiman
This is a small caiman. It lives in South America. It likes to swim in rivers. It has hard skin for protection. It helps keep the water healthy. Do you like small animals?
Early Reader · Change the reading level on the articleCyanosis
Sometimes skin can look blue. It happens when you need more air. You might see it on lips or nails. It helps us know to help you. It is okay to ask. Do you see blue colors in books?
Early Reader · Change the reading level on the articleCyclostomi
Some fish have round mouths. They do not have jaws. These fish are called lampreys and hagfish. They live in the water. They are very old. They are interesting to see! Do you like fish?
Early Reader · Change the reading level on the articleCymbopogon
Some grasses smell like lemons. They grow in warm places. People use them in food. They can also make soaps. This grass helps keep bugs away. It is a very useful plant. Do you like the smell of lemons?
Early Reader · Change the reading level on the articleCynodon
This is a type of grass. It grows in warm places. It is used for green lawns. It can live with very little water. It can even grow on sports fields. Do you like green grass?
Early Reader · Change the reading level on the articleCynodontia
These animals are like old cousins to us. They lived a long time ago. Some ate plants. Some ate meat. They helped lead to mammals. We are part of this big family! Can you find their teeth?
Early Reader · Change the reading level on the articleCyprinidae
Many kinds of fish live in fresh water. They are in a big fish family. Some are very small. Some are very big. You might see a goldfish at home. Do you like to see fish?
Early Reader · Change the reading level on the articleCysteine
Small parts build your body. These parts help you stay strong. They are in eggs and meat. They help your body work well. It is good for you! Do you like eggs?
Early Reader · Change the reading level on the articleCysticercosis
Tiny worms can get inside people. They can hide in the body. Sometimes they make small lumps. These lumps can hurt. It is good to wash hands. It is good to cook food well. Do you wash your hands?
Early Reader · Change the reading level on the articleCystic fibrosis
Some people have thick mucus in their bodies. It can get stuck in their lungs. This makes it hard to breathe. Their sweat can also taste very salty. Doctors help them stay well. Can you imagine breathing through…
Early Reader · Change the reading level on the articleCytokine
Tiny parts in your body talk. They send messages to your cells. These messages help you stay well. They help fight germs. They also help you grow. We need them to stay healthy. Do you feel strong today?
Early Reader · Change the reading level on the articleCytokinin
Plants have special things to help them grow. These things help new parts form. They help roots and stems get bigger. This helps the plant stay green. It helps the plant stay strong. Can you find a green plant?
Early Reader · Change the reading level on the articleCytosol
Cells have a special liquid inside. This liquid is mostly water. It holds many tiny things. These things help the cell work. It is like a busy soup. Does your body have cells too?
Early Reader · Change the reading level on the articleDactyloidae
Anoles are small lizards. They live in warm places. Many are green or brown. They can even change color! Some have a bright flap on their throat. They like to eat bugs. Do you want to see one?
Early Reader · Change the reading level on the articleDaeodon
A big animal lived long ago. It had a very large head. It ate plants and meat. This helped it stay strong. It lived in North America. Can you imagine a head that big?
Early Reader · Change the reading level on the articleDalbergia
Some trees have very special wood. These trees grow in warm places. Their wood can smell very sweet. People use the wood to make music tools. They also make pretty chairs. Do you like the smell of wood?
Early Reader · Change the reading level on the articleDallasaurus
This was a small lizard. It lived a long time ago. It could walk on land. It could also swim in water. This helps us learn about sea life. Can you imagine a swimming lizard?
Early Reader · Change the reading level on the articleDall sheep
These sheep live in high mountains. They have white fur. The males have big, curly horns. They eat grass and plants. This helps them stay strong. Do you like looking at mountains?
Early Reader · Change the reading level on the article