Postosuchus
Postosuchus was a big reptile. It lived a long time ago. It had very sharp teeth. It was a great hunter. It was much bigger than small dinosaurs. Do you think it was fast?
Early Reader · Change the reading level on the articleLife Science articles — Page 93
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 93 of 116
Explore related Science Lab activities about plants, animals and ecosystems or the human body, each at five reading levels.
Post-transcriptional modification
Your tiny cells make things. They make a special part first. Then they change it. They add a cap to the top. They add a tail to the end. This helps it work well. Do you want to learn more?
Early Reader · Change the reading level on the articlePost-translational modification
Tiny parts in your body change. They grow to do work. They can add new bits. This helps them do a job. It is like adding a tool. Do you want to learn more?
Early Reader · Change the reading level on the articlePotamotrygonidae
River stingrays live in rivers. They are flat and round. Many have spots on them. They eat small fish and bugs. They have a stinger on their tail. Do you like fish?
Early Reader · Change the reading level on the articlePotoo
The potoo is a funny bird. It lives in warm forests. It looks like a tree stump. This helps it hide from danger. It eats bugs at night. Can you find it?
Early Reader · Change the reading level on the articlePotoroo
The potoroo is a small animal. It lives in Australia. It is like a tiny kangaroo. We must help them stay safe. They are very special to us. Do you like small animals?
Early Reader · Change the reading level on the articlePouched lamprey
A lamprey is a long fish. It looks like an eel. It has no jaws. It uses a sucker to eat. This fish lives in the sea and rivers. It is a very cool fish! Do you like fish?
Early Reader · Change the reading level on the articlePouch (marsupial)
Some moms have a special skin pocket. This pocket is called a pouch. A tiny baby crawls inside to stay safe. The baby stays there to grow big. It is a warm place for the baby. Do you like cozy places?
Early Reader · Change the reading level on the articlePouteria campechiana
This tree grows bright fruit. The fruit is yellow. It tastes sweet like a treat. It feels soft like an egg. You can eat it fresh. You can even make a shake. Do you like yellow food?
Early Reader · Change the reading level on the articlePouteria sapota
The mamey tree grows big fruit. The fruit is soft and sweet. It can be pink or red. People make yummy shakes with it. You might like the taste! Do you want to try some?
Early Reader · Change the reading level on the articlePrairie dog
Prairie dogs are small animals. They live in holes in the ground. They eat grass and seeds. Many other animals like to live near them. They are very busy! Do you like small animals?
Early Reader · Change the reading level on the articlePratincole
These birds have long wings. They fly fast in the sky. They catch bugs while they fly. They also run on the ground. You can see them at dusk. They like warm places. Do you like to watch birds fly?
Early Reader · Change the reading level on the articlePrawn
A prawn is a small sea animal. It has ten legs. Some people eat them for food. They live in the water. They can be big or small. Do you like to eat them?
Early Reader · Change the reading level on the articlePraya dubia
A giant sea animal lives deep in the ocean. It is very long but thin. It is made of many tiny parts. These parts work as one team. It glows with a bright blue light. Can you see it glow?
Early Reader · Change the reading level on the articlePrecious coral
Red coral lives in the sea. It looks like a small bush. It has a bright red color. People use it to make pretty jewelry. It can be a ring or a necklace. Do you like red coral?
Early Reader · Change the reading level on the articlePrehensile-tailed porcupine
This animal lives in trees. It has a tail that can grab. Its feet also help it climb. It eats leaves and fruit. It can live a long time. Do you like trees?
Early Reader · Change the reading level on the articlePresbyopia
Your eyes change as you grow old. It gets hard to see small things. You might hold a book far away. This can make your eyes feel tired. Many adults have this. It is okay! Can you see things clearly?
Early Reader · Change the reading level on the articlePresbyornis
A long ago bird lived in North America. It had a very long neck. It had long legs too. It lived in groups by shallow lakes. It used its flat beak to find food in the water. Can you imagine a bird like this?
Early Reader · Change the reading level on the articlePriacanthidae
Bigeye fish live in the sea. They are often bright red. These fish have very large eyes. Their eyes help them see at night. They like to hide near rocks. Can you see their big eyes?
Early Reader · Change the reading level on the articlePriapulida
These are tiny sea worms. They live in the mud. They eat other small things. Some live in deep, cold water. Some live in warm water. They have been around for a very long time. Do you like looking at sea life?
Early Reader · Change the reading level on the articlePride
Pride is a big feeling. It happens when you do well. You might smile or lift your chin. It feels very good to win. It helps you try hard. Do you feel proud too?
Early Reader · Change the reading level on the articlePrimary production
Plants make their own food. They use light from the sun. They also use air and water. This helps them grow big. All living things need this food. It helps us too. Do you like to eat plants?
Early Reader · Change the reading level on the articlePrimary vein
A leaf has a main line in the middle. This line helps the leaf stay strong. It moves food and water to the leaf. This helps the plant grow well. It is like a tiny road for the plant. Can you find a leaf outside? Look…
Early Reader · Change the reading level on the articlePrimula
These are pretty flowers. They bloom in the spring. They can be pink or blue. They can even be yellow. They look good in a garden. Do you like spring flowers?
Early Reader · Change the reading level on the articleProboscis
Some animals have long noses or mouths. They use them to eat. A moth uses its long mouth to drink from a flower. It helps them find food. Do you have a long nose?
Early Reader · Change the reading level on the articleProboscis monkey
This monkey has a big nose. It lives on a large island. The monkey can swim in the water. It eats fruit and leaves. It is a very special animal. Do you like monkeys?
Early Reader · Change the reading level on the articleProcambarus alleni
This is a blue crayfish. It lives in the water in Florida. Some look brown, but some are bright blue. People like to keep them in tanks at home. They are very pretty to see. Do you like blue animals?
Early Reader · Change the reading level on the articleProceedings of the National Academy of Sciences of the United States of America
This is a special book for science. It shares new things we learn. Many people read it to learn. It helps us know the world. It is very old and good. Do you like to learn new things?
Early Reader · Change the reading level on the articleProcellariidae
These are sea birds. They live in the ocean. They eat fish and squid. They can fly very far. They are great at swimming. Do you like the sea?
Early Reader · Change the reading level on the articleProconsul (mammal)
Long ago, a small animal lived in trees. It lived in Africa. This animal did not have a tail. It might be a relative of us. We find its old bones in the ground. Can you imagine living in a forest?
Early Reader · Change the reading level on the articleProganochelys
This was a very old turtle. It had a hard shell. It ate plants for food. It had a long tail with spikes. It lived a long time ago. Do you like turtles?
Early Reader · Change the reading level on the articleProgymnosperm
Long ago, there were special plants. They grew big like trees. They had wood to help them stand. These plants are now gone. They helped new plants grow. Can you imagine a forest like that?
Early Reader · Change the reading level on the articleProlibytherium
A long animal lived long ago. It looked like a deer. The males had big bumps on their heads. The females had small ones. We find their bones in the dirt. It is a fun mystery. Can you find a bone?
Early Reader · Change the reading level on the articleProline
Tiny parts build our bodies. One part is called proline. It helps make the things that hold us together. Your body can even make it! It is a small but big help. Do you want to learn more?
Early Reader · Change the reading level on the articlePromoter (genetics)
Your body has a set of plans. These plans tell your cells what to do. A special spot on the plans starts the work. It tells the cell to make something new. This helps you grow and stay well. Do you want to learn more?
Early Reader · Change the reading level on the articleProprioception
Your body knows where it is. It can feel your arms move. It can feel your legs move. This helps you stay balanced. You do not even have to think about it! Can you move your hand without looking?
Early Reader · Change the reading level on the articleProteasome
Tiny parts in your body work hard. They clean up old bits. They break things down into food. This helps you stay healthy. It is like a little recycling machine. Do you like to recycle?
Early Reader · Change the reading level on the articleProtected area
Some places are kept safe. They are special parts of Earth. People help protect them. This helps animals and plants live. It keeps our world healthy. Do you like nature?
Early Reader · Change the reading level on the articleProtein biosynthesis
Your body makes tiny parts called proteins. These parts help you grow. They do many jobs in your cells. They work hard every day. It is like a tiny factory inside you! Can you feel your body working?
Early Reader · Change the reading level on the articleProtein engineering
People can change how tiny parts work. These parts help us stay well. Scientists change them to make new things. This can help make medicine. It is very cool work. Do you want to learn more?
Early Reader · Change the reading level on the articleProtein folding
Tiny parts in your body fold up. They start as long strings. Then they bend into new shapes. This helps them do work. This work keeps you healthy. Can you imagine a tiny shape folding?
Early Reader · Change the reading level on the articleProteinogenic amino acid
Tiny bits make your body. They build your proteins. You need them to grow. Some come from your food. Do you eat healthy food? We need them to stay strong!
Early Reader · Change the reading level on the articleProtein structure
Tiny bits join to make proteins. These bits make a long chain. The chain folds into a new shape. This shape helps your body work. It is like a small machine. Can you imagine tiny machines inside you?
Early Reader · Change the reading level on the articleProtein targeting
Tiny parts move in your body. They go to the right spots. Each part has a little map. This map shows where to go. It helps your body work well. Can you find a map?
Early Reader · Change the reading level on the articleProteome
Your body is made of tiny parts. These parts are called proteins. They work in many ways. They help you stay healthy. We can study them to learn more. What do you think they do?
Early Reader · Change the reading level on the articleProteomics
Tiny parts called proteins live in you. They help your body work. They help you grow and stay strong. They even help you fight germs. Scientists study them to learn more. Can you find them in your body?
Early Reader · Change the reading level on the articleProterosuchus
This was a big reptile. It lived long ago. It had a big head. Its nose was hooked. It hunted for food. It had scaly skin. Do you like big lizards?
Early Reader · Change the reading level on the articleProtocarnivorous plant
Some plants catch bugs. They use sticky parts to trap them. These plants do not eat the bugs like other plants. They just catch them. It is very cool to see. Do you like bugs?
Early Reader · Change the reading level on the article