Old Tjikko
There is a very old tree. It lives in a cold place. The roots are very, very old. New parts grow from the old roots. It can live for a long time. Can you find a tree near you?
Early Reader · Change the reading level on the articleLife Science articles — Page 86
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 86 of 116
Explore related Science Lab activities about plants, animals and ecosystems or the human body, each at five reading levels.
Old World oriole
These are bright birds. They live in many places. They eat fruit and bugs. They make nests in trees. Their nests look like small cups. Do you like bright colors?
Early Reader · Change the reading level on the articleOld World porcupine
The porcupine is a large animal. It has many sharp spines. These spines cover its body. It eats fruit and roots. The spines help keep it safe. Do you like to look at animals?
Early Reader · Change the reading level on the articleOld World quail
Quails are small, plump birds. They live on the ground. They like to eat seeds and bugs. Some fly very far away. A group is called a flock. Can you find a bird flock? They are very neat to see.
Early Reader · Change the reading level on the articleOld World warbler
These are small birds. They live in many places. Most eat bugs and seeds. They build nests in plants. Both parents help the babies. The babies can fly soon. Do you like birds?
Early Reader · Change the reading level on the articleOle Worm
Ole Worm was a smart man. He studied many things. He looked at old rocks and plants. He also helped sick people. He loved to learn new things. Do you like to learn too?
Early Reader · Change the reading level on the articleOligochaeta
Many worms live in the dirt. Some live in the water. They have soft bodies. They help the ground stay good. These worms are very cool. Can you find one in the garden?
Early Reader · Change the reading level on the articleOlive baboon
The olive baboon is a large monkey. They live in Africa. They live in forests and grass lands. They live in big groups. They like to stay together. Do you like monkeys?
Early Reader · Change the reading level on the articleOliver Sacks
Oliver Sacks was a doctor. He studied how the brain works. He wrote many books about his patients. His stories help us learn. He was a great writer. Do you like to read stories?
Early Reader · Change the reading level on the articleOlm
The olm is a cave animal. It lives in dark water. It cannot see with eyes. It uses smell to find food. It has pink skin. It is a cool little creature. Do you like caves?
Early Reader · Change the reading level on the articleOmega−3 fatty acid
Some oils help our bodies grow. We find them in fish and seeds. They help our brains and eyes. They are very good for us. Do you eat healthy foods?
Early Reader · Change the reading level on the articleOmnivore
Some animals eat many things. They eat plants. They also eat other animals. This helps them find food. It is good to have many choices. Do you eat plants and meat too?
Early Reader · Change the reading level on the articleOnager
The onager is a wild animal. It looks like a small horse. It has a dark stripe on its back. This animal can run very fast. It lives in dry, sandy places. Do you like fast animals?
Early Reader · Change the reading level on the articleOnchocerciasis
Tiny worms can make people sick. Small flies carry them. These flies live near rivers. The worms can hurt your eyes. You can wear long clothes to stay safe. Can you stay away from flies?
Early Reader · Change the reading level on the articleOncorhynchus
Some fish live in cold water. They swim in the big ocean. They also swim in rivers. These fish are very strong. They help us have food to eat. Do you like to see fish?
Early Reader · Change the reading level on the articleOnychomycosis
Some tiny things can live on nails. They can make nails look yellow. The nails might get thick. This can happen to toes. It can happen to fingers too. It can feel bad sometimes. Do your nails look healthy?
Early Reader · Change the reading level on the articleOnychophora
Velvet worms are soft animals. They have many small legs. These legs help them move. They use sticky slime to catch food. This slime is like glue. It helps them stay safe. Do you want to see their tiny claws?
Early Reader · Change the reading level on the articleOomycete
Some tiny things look like mold. They live in wet places. They can make plants sick. Some even hurt fish. They help break down old things. We must watch them! Can you find mold in your garden?
Early Reader · Change the reading level on the articleOpabinia
This animal lived long ago. It lived on the sea floor. It had five eyes on its head. It used a long nose to find food. This helped it eat. Do you think it was strange?
Early Reader · Change the reading level on the articleOpah
The opah is a big fish. It is red and orange. It has white spots. It stays warm in cold water. This helps it swim fast. Do you like bright colors?
Early Reader · Change the reading level on the articleOpen fracture
A bone can break. Sometimes it breaks through the skin. This makes a cut. It can hurt a lot. Doctors help fix it. They clean the cut. Do you know where your bones are?
Early Reader · Change the reading level on the articleOperating theater
Doctors work in a special room. It is very clean. The room has bright lights. This helps doctors see well. They wear masks and caps. This keeps germs away. It helps people get well. Do you like bright lights?
Early Reader · Change the reading level on the articleOperon
Tiny parts of life work as a team. These parts stay close together. They turn on or off at the same time. This helps the cell do its job. It is like a group of friends. Do you like working in a team?
Early Reader · Change the reading level on the articleOphioglossidae
Some ferns are very special. They grow in the ground. They do not have real roots. These plants help the earth. It is fun to find them! Can you look for green plants?
Early Reader · Change the reading level on the articleOphthalmosaurus
This was a sea animal. It had very big eyes. It lived a long time ago. It used its tail to swim. Its small teeth helped it eat. Can you imagine swimming with big eyes?
Early Reader · Change the reading level on the articleOpiliones
These bugs have very long legs. They look like spiders. But they are not spiders. They do not make webs. They are safe for you. Do you see them in the grass?
Early Reader · Change the reading level on the articleOpportunistic infection
Tiny germs can make us sick. Most of the time, our bodies fight them off. But sometimes, our bodies are weak. Then, the germs can cause trouble. We must stay healthy and strong. Do you wash your hands to stay well?
Early Reader · Change the reading level on the articleOptic nerve
Your eyes help you see. A tiny cord sends what you see to your brain. This cord carries colors and light. It helps you know what is near. It is very important for seeing. Can you see the light?
Early Reader · Change the reading level on the articleOral administration
You can take medicine by mouth. You swallow a pill or a liquid. It goes into your tummy. This can be easy and not hurt. It helps you feel better. Do you like taking medicine with water?
Early Reader · Change the reading level on the articleOrb-weaver spider
Some spiders make round webs. They build these in gardens. The webs have sticky silk. This helps them catch food. They often build a new web each day. Do you see webs in your yard?
Early Reader · Change the reading level on the articleOrder (biology)
Scientists group living things together. They put related families in a group. This group is called an order. It helps us learn about nature. It is a great way to see how things fit. Do you like to group your toys?
Early Reader · Change the reading level on the articleOregano
Oregano is a green plant. It has small flowers. The flowers can be pink or white. People use the leaves for food. It makes food taste good. Do you like oregano on your pizza?
Early Reader · Change the reading level on the articleOrganic matter
Things that were once alive turn into soil. This comes from dead plants and animals. It helps the ground hold water. It also gives food to new plants. This helps our world grow. Can you find old leaves in the dirt?
Early Reader · Change the reading level on the articleOrgan system
Your body has many parts. These parts work as a team. They help you move and grow. They also help you breathe. This team keeps you healthy. We are amazing! What can your body do?
Early Reader · Change the reading level on the articleOriental garden lizard
This lizard can change color. It can turn bright red. It lives in trees and bushes. It eats small bugs for food. You might see it in the sun. Do you like bright colors?
Early Reader · Change the reading level on the articleOriental giant squirrel
These squirrels are very big. They live in trees. They are the size of a cat. They live in parts of Asia. These animals are fun to see. Do you like squirrels?
Early Reader · Change the reading level on the articleOriental pied hornbill
This bird is a hornbill. It lives in big forests. It eats fruit and bugs. This helps new trees grow. We love to see them fly! Can you see its big beak?
Early Reader · Change the reading level on the articleOriental rat flea
A tiny flea lives on rats. It is very small. It can jump very far. It uses its legs to jump. It can jump to find food. This flea can bite you. Do you see any fleas?
Early Reader · Change the reading level on the articleOriental Shorthair
This is a special kind of cat. They have big ears and long bodies. These cats can be many colors. They like to play and talk to you. They are very smart, too. Do you like cats?
Early Reader · Change the reading level on the articleOrnithischia
Some dinosaurs were plant eaters. They lived a long time ago. Many of them lived in big groups. Some had hard skin or horns. They were very big and strong. Do you like dinosaurs?
Early Reader · Change the reading level on the articleOrnithocheirus
This was a flying thing. It lived a long time ago. It lived near the sea. Some bones were found in England. These bones help us learn. Can you imagine it flying?
Early Reader · Change the reading level on the articleOrnithology
Some people study birds. They look at how birds live. They see where birds fly. This helps us know birds better. It is very fun to learn. Do you like birds too?
Early Reader · Change the reading level on the articleOrnithomimosauria
Some dinosaurs looked like birds. They could run very fast. They had soft feathers on them. Most of them ate plants. These dinosaurs lived a long time ago. Do you like fast animals?
Early Reader · Change the reading level on the articleOrnithomimus
This was a fast dinosaur. It could run very well. It had soft feathers. It had a small beak. It ate many kinds of food. It lived a long time ago. Can you run fast like it?
Early Reader · Change the reading level on the articleOrnithopoda
Some dinosaurs were plant eaters. They had feet like birds. Some were small and fast. They ran on two legs. Others were big. They walked on four legs. They had great teeth for chewing. Do you like dinosaurs?
Early Reader · Change the reading level on the articleOrrorin
Long ago, a special ape lived. It lived in Kenya. This ape could walk on two legs. It could also climb trees. It is like an early friend to us. Do you like to climb trees?
Early Reader · Change the reading level on the articleOrthoceras
This was a sea animal. It had a long, straight shell. It lived a long time ago. Its shell looks like a horn. You can find its bones in rocks. It is very cool! Do you like old shells?
Early Reader · Change the reading level on the articleOrthodontics
Sometimes teeth are not straight. They may be too crowded. A doctor can help fix them. They use small tools to move teeth. This helps your smile look good. Do you have straight teeth?
Early Reader · Change the reading level on the article