Systematics
People study how life is linked. They look at all living things. They find how things are related. This helps us know our world. It is a big job. Do you like to sort things?
Early Reader · Change the reading level on the articleLife Science articles — Page 106
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 106 of 116
Explore related Science Lab activities about plants, animals and ecosystems or the human body, each at five reading levels.
Systems biology
Scientists study how living things work. They look at all the small parts together. It is like looking at a whole machine. This helps us learn how life works. It is very cool to see! Do you like to see how things work?
Early Reader · Change the reading level on the articleTabasco pepper
The tabasco pepper is a small plant. It comes from Mexico. The fruit starts green. Then it turns orange and red. These peppers can be very hot! We use them to make sauce. Do you like spicy food?
Early Reader · Change the reading level on the articleTabby cat
A tabby is a kind of cat. They have stripes or spots. You can see an M on their head. This helps them hide in the grass. Many cats look like this. Do you see a tabby cat?
Early Reader · Change the reading level on the articleTachinidae
These are tachinid flies. They are small flies. Some look like house flies. They help us by eating pests. This helps plants grow well. Can you find a fly?
Early Reader · Change the reading level on the articleTachycardia
Your heart beats to help you. Sometimes it beats very fast. This can happen when you run. It can also happen when you are scared. A fast heart can make you feel dizzy. Does your heart beat fast when you play?
Early Reader · Change the reading level on the articleTadorna
Shelducks are large birds. They look like ducks and geese. They eat plants and small sea life. You might see them on land too. They have pretty wings. Can you find a shelduck?
Early Reader · Change the reading level on the articleTaeniasis
{ "text": [ "Small worms can live in your tummy. ", "They come from meat that is not cooked enough.", "You might not even feel sick.", "Eating hot, cooked meat helps keep you safe.", "It is good to wash your hands…
Early Reader · Change the reading level on the articleTaenia solium
A small worm lives in pigs. It can also live in people. This happens if meat is not cooked well. It can make your tummy hurt. Do you like to eat cooked food?
Early Reader · Change the reading level on the articleTaeniodonta
Long ago, some animals lived on Earth. They had very strong teeth. These teeth helped them eat tough plants. They used their noses to smell for food. They were big like bears. Can you imagine a bear with huge teeth?
Early Reader · Change the reading level on the articleTahr
The tahr is a large animal. It is like a goat or a sheep. These animals live in Asia. They eat in the morning and evening. Then they take a long rest. They are very special. Do you like goats?
Early Reader · Change the reading level on the articleTaipan
The taipan is a big snake. It lives in Australia. These snakes move very fast. They eat small rats. They are very dangerous to us. We must be careful. Do you like snakes?
Early Reader · Change the reading level on the articleTakahē
The takahē is a big bird. It lives in New Zealand. This bird cannot fly. It has blue and green feathers. It eats green grass. We help keep these birds safe. Do you like big birds?
Early Reader · Change the reading level on the articleTakin
The takin is a big animal. It lives in high mountains. It has thick hair to stay warm. This animal looks a bit like a goat. It eats leaves and grass. Do you like mountain animals?
Early Reader · Change the reading level on the articleTamandua
The tamandua is a small anteater. It lives in trees and grass. It eats many tiny bugs. It uses a long tongue for food. It is a fun animal to see. Do you like bugs?
Early Reader · Change the reading level on the articleTamarin
Tamarins are small monkeys. They live in the trees. Many have hair like a mustache. They eat fruit and bugs. They like to live in groups. Do you like monkeys too?
Early Reader · Change the reading level on the articleTambaqui
The tambaqui is a big fish. It lives in warm rivers. It eats seeds and fruit. This helps new plants grow. We can see them in many places. Have you seen a big fish?
Early Reader · Change the reading level on the articleTamisiocarididae
These were old sea animals. They lived in warm water. They used tiny spines to catch food. It worked like a net. This helped them eat. Can you imagine a sea net?
Early Reader · Change the reading level on the articleTanager
Tanagers are bright birds. They live in warm places. Many have pretty colors. They eat fruit and bugs. They build small nests in trees. These birds are so neat! Do you like bright colors?
Early Reader · Change the reading level on the articleTangerine
A tangerine is a small fruit. It is a bright orange color. It tastes very sweet. You can peel it with your hands. It is good to eat. Do you like sweet fruit?
Early Reader · Change the reading level on the articleTanystropheus
This was a long reptile. It had a very long neck. The neck was longer than its body. It lived in the water. It used its neck to catch food. It was a very cool animal. Do you like long necks?
Early Reader · Change the reading level on the articleTapejaridae
These were flying animals from long ago. They lived in many lands. They had big heads with bony crests. They used their eyes to find food. They could fly and climb trees. Do you like to fly like a bird?
Early Reader · Change the reading level on the articleTapinoma melanocephalum
The ghost ant is a tiny ant. It has a dark head. Its legs look pale and clear. This makes it hard to see. It likes warm places. It can live in a house. Can you find a tiny ant?
Early Reader · Change the reading level on the articleTapinoma sessile
Small ants live in your house. They like sweet food. They can smell like a coconut. These ants are very tough. They can live in heat or cold. Do you see them?
Early Reader · Change the reading level on the articleTaproot
Some plants have one big root. It grows straight down. It is thick and strong. This root holds the plant in the dirt. It can even store food. We eat some of these roots. Do you like carrots?
Early Reader · Change the reading level on the articleTarantula hawk
This is a big wasp. It has blue bodies and orange wings. It hunts large spiders. The wasp uses a sting to stop them. This helps the wasp grow its babies. It is a very cool bug. Do you like big bugs?
Early Reader · Change the reading level on the articleTarpan
The tarpan was a wild horse. They lived in open fields. These horses were small and fast. They had dark legs and hair. People used to hunt them. Now they are gone. Do you like horses?
Early Reader · Change the reading level on the articleTarpon
The tarpon is a big fish. It has shiny, silver scales. It can swim in salt water and fresh water. It even gulps air to breathe! This fish is very strong. Do you like to see fish jump?
Early Reader · Change the reading level on the articleTarragon
Tarragon is a green plant. It has long leaves. Some people use it in food. It can make a drink green. It smells very good. Do you like green food?
Early Reader · Change the reading level on the articleTarsus (skeleton)
Seven bones sit in your foot. They are near your ankle. One big bone makes your heel. This bone helps you stand up. These bones help you walk. Can you feel your heel?
Early Reader · Change the reading level on the articleTaung Child
A long time ago, a skull was found. It belonged to a young child. This child lived in Africa. It helps us learn about our past. It is a very big find. Can you imagine finding it?
Early Reader · Change the reading level on the articleTaurine
Some things live in animals. This one is in meat and fish. It helps cats stay healthy. It is also in some drinks. Do you like fish? It is in many foods.
Early Reader · Change the reading level on the articleTaxaceae
Yews are small trees and bushes. They stay green all year. Their seeds are very bad for us. But birds like to eat the sweet fruit around them. This helps the seeds grow in new places. Do you like birds?
Early Reader · Change the reading level on the articleTaxodium distichum
This is a big tree. It lives in wet places. The leaves turn red in the fall. People use the wood for doors. It can live for a very long time. Can you find a tree like this?
Early Reader · Change the reading level on the articleTaxon
We put living things in groups. These groups help us learn. We can group plants and animals. This helps us know them well. It is like sorting your toys. Do you like to sort things?
Early Reader · Change the reading level on the articleTaxonomic rank
Scientists group living things. They use groups to show how things are alike. Big groups hold many things. Small groups hold just a few. This helps us learn about life. Do you like to group your toys?
Early Reader · Change the reading level on the articleTaxonomy
We put things in groups. We can group animals. We can group toys. This helps us find things fast. It makes things easy to see. Do you like to group your things?
Early Reader · Change the reading level on the articleTaxus
The yew is a green tree. It can live for a very long time. Some are even older than people! It has bright red fruit. Birds love to eat them. Do you like red fruit?
Early Reader · Change the reading level on the articleTaxus baccata
The yew is a green tree. It stays green all year. It has small red berries. Be careful because the tree is bad for you. Do not eat the parts of the tree. It is a very old tree. Have you seen a yew tree?
Early Reader · Change the reading level on the articleTaxus brevifolia
The Pacific yew is a small tree. It stays green all year. It grows in wet places. Birds eat its red fruit. This helps new trees grow. Do you like red berries?
Early Reader · Change the reading level on the articleT. Berry Brazelton
Dr. Brazelton was a doctor for babies. He helped doctors learn about little ones. He wrote many books for moms and dads. He wanted to help every baby grow well. His work helps families today. Do you know a baby?
Early Reader · Change the reading level on the articleT cell
Tiny cells help keep us well. They fight bad things in our body. Some cells are like helpers. Other cells are like fighters. They work hard to keep us safe. Do you feel strong today?
Early Reader · Change the reading level on the articleTeak
The teak is a big tree. It grows in warm places. The wood is very strong. It can even stay safe in water. People use it to make boats. Do you like boats?
Early Reader · Change the reading level on the articleTears
Tears are a clear liquid. They stay on your eyes. They keep your eyes wet. They wash away dust. They help when you feel sad. They also come out when you are happy. Do you ever cry?
Early Reader · Change the reading level on the articleTeff
Teff is a tiny grass. It grows in warm places. The seeds are very small. We use them for food. They help make flat bread. It is a special plant. Do you like bread?
Early Reader · Change the reading level on the articleTegenaria domestica
This spider lives in our homes. It is brown or tan. It makes a web like a funnel. The web helps it catch food. It likes to hide in dark spots. Do you see a web in your house?
Early Reader · Change the reading level on the articleTeiidae
Some lizards live in the Americas. They are fast and like to run. They have long tongues like snakes. They eat bugs for food. These lizards are very cool to see. Do you like lizards too?
Early Reader · Change the reading level on the articleTelehealth
Doctors can help you from far away. They use screens and phones. You can talk to them at home. This helps if you cannot travel. It is a smart way to stay well. Can you use a computer to see a doctor?
Early Reader · Change the reading level on the article