Rhynchosauria
Rhynchosaurs were old reptiles. They had strong beaks. They used them to eat plants. These plants were very tough. They lived a long time ago. Can you imagine a beak like that?
Early Reader · Change the reading level on the articleLife Science articles — Page 97
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 97 of 116
Explore related Science Lab activities about plants, animals and ecosystems or the human body, each at five reading levels.
Rhyniophyte
Long ago, tiny plants lived on land. They had small stems. They did not have leaves. They did not have roots. These plants were very simple. They are all gone now. Do you like old plants?
Early Reader · Change the reading level on the articleRib
Your ribs are long, curved bones. They make a cage around your chest. This cage keeps your heart safe. It also helps you breathe air. We all have them! Can you feel your ribs?
Early Reader · Change the reading level on the articleRibbon diagram
Scientists use special drawings. These drawings show tiny parts of life. They look like colorful ribbons. They show how small things fold. These help us learn a lot. They make hard things easy to see. Do you like…
Early Reader · Change the reading level on the articleRibbon eel
The ribbon eel is a long fish. It lives in the warm ocean. Some are black and some are blue. They hide in the sand. They can live for a long time. Do you like bright fish?
Early Reader · Change the reading level on the articleRibbonfish
The ribbonfish is a slim fish. It looks like a long ribbon. It lives in very deep water. It is hard to see it alive. We can find it in the sea. Do you want to see one?
Early Reader · Change the reading level on the articleRib cage
Your ribs make a cage. It is inside your chest. It keeps your heart safe. It also keeps your lungs safe. This cage helps you breathe air. Can you feel your ribs?
Early Reader · Change the reading level on the articleRibes
Some plants grow small berries. These are called currants. You can eat them. They can be red or black. Some are even white. They grow on bushes. Do you like berries?
Early Reader · Change the reading level on the articleRibosomal RNA
Tiny parts live in your cells. They help make food for your body. These parts work like little machines. They are very important for life. We need them to grow. Do you want to learn more?
Early Reader · Change the reading level on the articleRicefish
Ricefish are very small fish. They live in water near Asia. Some live in rice fields. They are fun to watch in tanks. You can see them swim. Do you like small fish?
Early Reader · Change the reading level on the articleRichard Leakey
Richard Leakey loved nature. He lived in a place called Kenya. He looked for very old bones. These bones showed how people lived long ago. He also helped keep wild animals safe. He was a very busy man. Do you like…
Early Reader · Change the reading level on the articleRichard Owen
Richard Owen loved old bones. He studied them for a long time. He gave the name dinosaur to big lizards. He helped build a big museum. You can visit it today! Do you like dinosaurs?
Early Reader · Change the reading level on the articleRichard von Krafft-Ebing
Richard was a doctor. He helped people with their minds. He studied how people feel. He wrote books to help. This work was very important. Do you want to be a doctor?
Early Reader · Change the reading level on the articleRicinulei
These are tiny bugs. They live in dark caves. They hide under leaves. They have a little hood over their face. It is like a tiny hat. Can you find them?
Early Reader · Change the reading level on the articleRickets
Some kids have soft bones. This can happen if they do not get enough sun. They also need good food to stay strong. This helps your bones grow right. Do you eat good food to stay strong?
Early Reader · Change the reading level on the articleRiftia
These are giant tube worms. They live deep in the sea. They live near hot vents. They do not eat food like us. Tiny bugs inside them help them grow. It is a busy home! Do you like the deep sea?
Early Reader · Change the reading level on the articleRift Valley fever
Some bugs can make us sick. These bugs are mosquitoes. They can bite cows and sheep. This can make animals feel bad. It can make people feel bad too. We can stay safe from bites. Do you like to stay safe?
Early Reader · Change the reading level on the articleRight whale
Right whales are very big. They live in the ocean. They have dark skin. They have white spots on their heads. These whales are special to see. Can you find them in the sea?
Early Reader · Change the reading level on the articleRight whale dolphin
These dolphins are black and white. They do not have a fin on their back. They swim very fast in the sea. They like to live in big groups. It is fun to watch them leap. Can you see them swim? They are very special…
Early Reader · Change the reading level on the articleRinderpest
A bad sickness once hurt cows. It made them very ill. It spread through water and air. People worked hard to stop it. Now, the sickness is gone. We helped save the animals. Can you believe it is gone?
Early Reader · Change the reading level on the articleRing finger
This is the ring finger. It is between your middle finger and your little finger. Many people wear a ring on it. This shows love for a partner. It is a special finger. Do you wear a ring on your hand?
Early Reader · Change the reading level on the articleRingtail
The ringtail is a small animal. It has a very long tail. The tail has white stripes. It helps the animal climb trees. This animal likes to be out at night. Do you like to look at the stars?
Early Reader · Change the reading level on the articleRing-tailed lemur
The ring-tailed lemur is a small animal. It has a long tail. The tail has black and white rings. It lives on a big island. They like to sit in the sun. Do you like the sun too?
Early Reader · Change the reading level on the articleRiparian zone
Some land sits by a river. This land is wet. Plants grow here. Trees give shade to the water. Animals find food and homes here. It helps keep the water clean. Do you like to visit the water?
Early Reader · Change the reading level on the articleRisso's dolphin
This is a special dolphin. It lives in the big ocean. It has white marks on its skin. These marks look like scars. They help the dolphins find each other. They like to swim in groups. Do you like dolphins too?
Early Reader · Change the reading level on the articleRiver dolphin
River dolphins live in rivers. They swim in warm water. Some are even pink! They use sounds to find fish. This helps them see in muddy water. They are very special. Do you like dolphins?
Early Reader · Change the reading level on the articleRiver ecosystem
Rivers are water that flows. They move through the land. Small streams flow into big rivers. Many plants and animals live there. It is a busy place for life. Do you like to visit rivers?
Early Reader · Change the reading level on the articleRiver shark
Some sharks live in rivers. They swim in muddy water. They live in parts of Asia and Australia. These sharks are hard to find. We must help keep their homes clean. Do you like rivers?
Early Reader · Change the reading level on the articler/K selection theory
Animals have different ways to grow. Some have many babies at once. They grow up very fast. Other animals have only one baby. They take good care of them. This helps the baby grow strong. Do you see many babies in…
Early Reader · Change the reading level on the articleRNA interference
Your cells have a way to stay safe. They can stop bad things from growing. They use tiny bits of air-like parts to do this. This helps the cell work right. It is like a tiny shield for you. Can you imagine being that…
Early Reader · Change the reading level on the articleRNA polymerase
A tiny helper works in your body. It reads your body's plans. It makes a copy of the plans. This helps you grow and stay well. It is very busy! Do you wonder how it works?
Early Reader · Change the reading level on the articleRNA splicing
Our bodies make tiny parts to work. These parts have extra bits. The body cuts the extra bits out. Then it joins the good bits together. This helps us grow. Do you want to learn more?
Early Reader · Change the reading level on the articleRoadrunner
The roadrunner is a fast bird. It lives in the dry desert. It likes to run on the ground. It eats bugs and small snakes. This bird is very cool! Can you see it run?
Early Reader · Change the reading level on the articleRobert A. Kehoe
Robert was a doctor. He studied how things affect our bodies. He worked with companies that made gas. He said the gas was safe. Later, people found out he was wrong. Do you want to learn more?
Early Reader · Change the reading level on the articleRobert Atkins (physician)
Robert Atkins was a doctor. He helped people eat differently. He told them to eat less bread. He said to eat more fat and protein. His ideas became very famous. Do you like to eat healthy food?
Early Reader · Change the reading level on the articleRobert Brown (botanist, born 1773)
Robert Brown loved plants. He looked at them with a tool. This tool made tiny things look big. He found many new plants in a far land. He even found a tiny part in a plant cell. Can you find a plant today?
Early Reader · Change the reading level on the articleRobert Cialdini
Robert Cialdini is a wise man. He writes books about how people think. He studied how people talk to each other. His books help us understand people. His ideas help many people. Do you like to learn new things?
Early Reader · Change the reading level on the articleRobert Ettinger
Robert was a teacher. He had a big idea. He thought we could freeze bodies to stay safe. He hoped doctors could help people later. This idea was very new. Do you think it is a cool idea?
Early Reader · Change the reading level on the articleRobert Gallo
Robert is a scientist. He works to help sick people. He found a tiny germ that makes people ill. He also made a test to find it. This helps many people stay safe. Do you want to be a scientist too?
Early Reader · Change the reading level on the articleRobert Knox (surgeon)
Robert Knox was a doctor. He studied how bodies work. He taught many students. Some people were angry with him. He had a hard life. Do you like to learn about science?
Early Reader · Change the reading level on the articleRobert Rayford
Robert was a boy from Missouri. He got very sick. His body could not fight germs well. This was a big mystery for doctors. It helps us learn about germs today. Do you like learning about science?
Early Reader · Change the reading level on the articleRobert Sternberg
Robert is a man who studies how we think. He wants to know how we learn. He says being smart is more than just school work. You can be smart in many ways. Do you like to learn new things?
Early Reader · Change the reading level on the articleRobert Wadlow
Robert was a very tall man. He lived in a place called Illinois. He was the tallest person ever. This made him very famous. People loved to see him. Can you imagine being that tall?
Early Reader · Change the reading level on the articleRobert Whittaker (ecologist)
Robert was a man who loved plants. He studied how living things live. He found five groups for all life. This helps us learn about nature. He was a very smart man. Do you like to look at plants?
Early Reader · Change the reading level on the articleRobin Wall Kimmerer
Robin Wall Kimmerer loves plants. She studies small green moss. She also writes books about nature. Her work helps us learn. It is fun to look at plants. Do you like to look at plants too?
Early Reader · Change the reading level on the articleRock-wallaby
Rock-wallabies live in rocky places. They hide in caves during the day. They come out at night to eat. They are very good at jumping. These animals are small. We must help them stay safe. Can you see them jump?
Early Reader · Change the reading level on the articleRod cell
Small parts in your eye help you see. They help you see in the dark. They do not see colors well. These parts help you see at night. They are very helpful to us. Do you like to look at the stars?
Early Reader · Change the reading level on the articleRodenticide
Some food is made to stop rats. It can also stop mice. These foods can hurt pets too. We must be very careful. Do you see any traps?
Early Reader · Change the reading level on the article