Tusk shell
Tusk shells live in the sea. They hide in soft sand. They stay under the sand to stay safe. They use a foot to dig. It is fun to look for them. Can you find a shell in the sand?
Early Reader · Change the reading level on the articleLife Science articles — Page 111
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 111 of 116
Explore related Science Lab activities about plants, animals and ecosystems or the human body, each at five reading levels.
Tu Youyou
Tu Youyou is a smart scientist. She found a way to help sick people. She used a special plant to make medicine. This medicine helps people feel better. Her work saves many lives. Do you want to be a scientist too?
Early Reader · Change the reading level on the articleTwig
A twig is a small tree branch. It can be short or thin. Some animals use them like tools. Chimps use them to find food. They are very useful. Do you see twigs on the ground?
Early Reader · Change the reading level on the articleTwo-toed sloth
The two-toed sloth lives in trees. It hangs upside down all day. It moves very, very slowly. It eats leaves and fruit. This helps the sloth stay safe. Do you like slow animals?
Early Reader · Change the reading level on the articleTylosaurus
The Tylosaurus was a large sea lizard. It lived in the ocean long ago. These lizards were very big. They helped rule the sea. It is fun to learn about them! Can you imagine a giant sea lizard?
Early Reader · Change the reading level on the articleType 1 diabetes
Our bodies need food for energy. Sometimes, the body cannot use sugar well. It needs help to stay strong. This help comes from a tiny medicine. You can stay healthy with care. Do you want to learn more?
Early Reader · Change the reading level on the articleType 2 diabetes
Your body needs food for energy. Sometimes, too much sugar stays in your blood. This can make you feel very tired. It can also make you very thirsty. Eating well helps you stay strong. Do you eat many fruits?
Early Reader · Change the reading level on the articleType genus
Some groups of animals have a main name. This name helps us sort them. It tells us how they are the same. This helps us learn about nature. It is like a big family tree. Can you find a bird in your yard?
Early Reader · Change the reading level on the articleType species
Scientists use a special rule for names. They pick one animal to lead a group. This animal keeps the group's name. It helps us know which group is which. This makes naming easy for us. Do you like naming things?
Early Reader · Change the reading level on the articleTypha latifolia
This plant grows in water. It has big leaves. It can grow very tall. It has a brown part on top. This part looks like a sausage. It helps the plant grow more. Do you like to see plants in a pond?
Early Reader · Change the reading level on the articleTyphoid vaccine
A shot can help keep you well. It stops a bad sickness. It helps many children stay safe. This is good for our health. We can stay strong. Do you want to stay healthy?
Early Reader · Change the reading level on the articleTyranni
Many birds live in South America. They have a special way to sing. These birds are very old. They have been around for a long time. It is fun to watch them fly. Can you see a bird today?
Early Reader · Change the reading level on the articleTyrannosauroidea
Some dinosaurs were big meat eaters. They lived a long time ago. Some were very small. Others were huge! They had long tails. They could run fast. Do you like big dinosaurs?
Early Reader · Change the reading level on the articleTyrosine
This is a tiny part of food. It helps our bodies grow. We find it in meat and milk. It also helps our brains work. It is very useful. Do you like cheese?
Early Reader · Change the reading level on the articleUakari
The uakari is a red monkey. It has a bright red face. Its head is bald. It lives in the trees. These monkeys eat fruit and seeds. They like to live in groups. Can you see their red faces?
Early Reader · Change the reading level on the articleUbiquitin
Tiny parts live in your body. These parts help your cells work. They can tag other parts. This tells the cell to fix them. It helps you stay well. Can you find tiny parts in you?
Early Reader · Change the reading level on the articleUdder
A cow has a part for milk. It hangs under the cow. It has small bumps. This part makes food for babies. It helps us get milk too. It is very helpful. Do you like milk?
Early Reader · Change the reading level on the articleUintatherium
A big animal lived long ago. It had bumps on its head. It was very large. It lived in green forests. It had big teeth. Do you think it was heavy?
Early Reader · Change the reading level on the articleUlcerative colitis
Sometimes the belly gets sick. It can hurt a lot. You might have to go to the bathroom many times. It can even make you feel very tired. Doctors can help you feel better. Do you want to learn more?
Early Reader · Change the reading level on the articleUlmaceae
Elm trees are a kind of plant. They grow in many places. Some are big trees. Some are small bushes. We use their wood to make chairs. They are very useful. Do you like trees?
Early Reader · Change the reading level on the articleUlmus americana
The American elm is a big tree. It grows in many places. Its leaves turn yellow in the fall. Some trees make a leafy roof over the street. This helps shade you. Can you find an elm tree?
Early Reader · Change the reading level on the articleUlmus davidiana
This is a small tree. It grows in many places. It likes to live near water. The leaves are a bit rough. The tree makes a lot of shade. It is a very nice tree. Do you like big trees?
Early Reader · Change the reading level on the articleUlmus glabra
The wych elm is a big tree. It grows in many places. It likes wet soil. It has very tough young branches. Some people use its wood for art. Do you like big trees?
Early Reader · Change the reading level on the articleUlmus laevis
This is a big tree. It likes to grow by rivers. It can stay in wet ground for a long time. This tree helps butterflies live. It is very pretty. Do you like big trees?
Early Reader · Change the reading level on the articleUlmus minor
The field elm is a big tree. It grows near rivers. It can live in dry dirt too. This tree helps the earth. It can live for a very long time. Do you like big trees?
Early Reader · Change the reading level on the articleUlmus parvifolia
This is a special tree. It has pretty bark. The bark looks like many colors. It is called a lacebark elm. It can grow in many places. Do you like trees?
Early Reader · Change the reading level on the articleUlmus pumila
This is a tree called an elm. It grows in many places. The leaves are green. In the fall, they turn yellow. It grows very fast. It can give you shade. Do you like trees?
Early Reader · Change the reading level on the articleUlmus rubra
The red elm is a big tree. It grows in many places. The wood inside is red. People can use the bark for tea. It helps a sore throat feel better. Do you like big trees?
Early Reader · Change the reading level on the articleUlna
You have a long bone in your arm. It goes from your elbow to your wrist. This bone is on the side of your pinky finger. It helps your arm move. Can you feel your arm bone?
Early Reader · Change the reading level on the articleUlric Neisser
Ulric Neisser studied the mind. He wanted to know how we think. He also looked at how we remember things. He found that memory can change. This helps us learn about people. Do you like to learn how your brain works?
Early Reader · Change the reading level on the articleUmbrella octopus
The umbrella octopus lives in the deep sea. It has skin between its arms. This skin looks like an umbrella. It helps the octopus stay safe. It is a very cool animal. Do you like the ocean?
Early Reader · Change the reading level on the articleUnderweight
Some people are very thin. Their bodies need more food. This can make them feel weak. It can also make them get sick. We want everyone to be healthy. Do you eat good food?
Early Reader · Change the reading level on the articleUnenlagiinae
These dinosaurs had long noses. They lived a long time ago. Most were found in a place called South America. They could run very fast. This helped them catch small food. Do you like fast dinosaurs?
Early Reader · Change the reading level on the articleUngulate
Some animals have hard feet. These are called hooves. You might see a zebra or a rhino. They use their hooves to walk. Many of them eat plants for food. Do you know any hoofed animals?
Early Reader · Change the reading level on the articleUnionida
These are freshwater mussels. They live in rivers and lakes. They have hard shells. The inside is shiny like a pearl. They help keep water clean. Do you like shiny things?
Early Reader · Change the reading level on the articleUnipedalism
Some things have only one foot. Some small sea life move this way. People can have one leg too. It is a very special way to move. We can see this in old stories. Do you know a one-legged creature?
Early Reader · Change the reading level on the articleUracil
Small bits help life grow. These bits are in your body. They help make things work. They can even be found in space. This is very cool! Do you like space?
Early Reader · Change the reading level on the articleUrban ecology
People live in big cities. Many birds and bugs live there too. We study how they live with us. This helps us keep nature safe. It is a big job. Can you find a tree in your town?
Early Reader · Change the reading level on the articleUreter
Your body has two small tubes. They carry liquid from your kidneys. The liquid goes to your bladder. This helps you go to the bathroom. These tubes work hard for you. Do you know where your kidneys are?
Early Reader · Change the reading level on the articleUrethra
Your body has a small tube. It carries pee out of you. This tube starts at your bladder. It helps you go to the bathroom. It is very useful. Do you know where it is?
Early Reader · Change the reading level on the articleUric acid
Your body makes something called uric acid. It is part of your pee. It helps keep your blood healthy. Sometimes, too much can make your joints hurt. Do you drink lots of water?
Early Reader · Change the reading level on the articleUrinary tract infection
Tiny germs can get into your body. They can make it hurt to pee. You might feel a sting. It can also make you feel hot. Doctors use medicine to help you feel better. Have you ever felt a sting when you pee?
Early Reader · Change the reading level on the articleUrination
Your body makes waste. It stays in a small bag. This bag is called a bladder. When it is full, you feel it. Then you go to the potty. It helps you stay clean. Do you know when you need to go?
Early Reader · Change the reading level on the articleUrine
Your body makes a liquid called urine. It helps clean your blood. It carries away extra water. It also carries away waste. This keeps you healthy. Do you drink enough water every day?
Early Reader · Change the reading level on the articleUrine test
Doctors can test your pee. This test helps them see how you work. It shows if your body is healthy. It is a quick way to learn things. It helps you stay well. Do you want to learn more?
Early Reader · Change the reading level on the articleUromastyx
These lizards have spikey tails. They live in hot places. They love to sit in the sun. They eat plants for food. They hide in holes at night. Can you see their spikes?
Early Reader · Change the reading level on the articleUropygi
Whip scorpions are small bugs. They have a long tail. Some people call them vinegaroons. They can spray a smell like vinegar. This helps them stay safe. Do you like the smell of vinegar?
Early Reader · Change the reading level on the articleUrsid hybrid
Some bears have two different parents. This makes a new kind of bear. They might look a little bit different. These bears can also have their own babies. It is a neat way to learn. Do you like bears?
Early Reader · Change the reading level on the article