Hemichordate
Some worms live in the sea. They look like little worms. Some live in holes in the sand. They eat tiny bits of food. These worms are very old. Can you find them in the ocean?
Early Reader · Change the reading level on the articleLife Science articles — Page 66
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 66 of 116
Explore related Science Lab activities about plants, animals and ecosystems or the human body, each at five reading levels.
Hemodialysis
Some people need help cleaning their blood. Their kidneys do not work well. A machine can clean the blood for them. This helps them stay healthy. It is a very smart way to help. Do you want to learn more?
Early Reader · Change the reading level on the articleHemorrhoid
Our bodies have soft parts inside. These parts help us go to the bathroom. Sometimes, they get puffy and sore. This can happen to many people. Eating good food helps them feel better. Have you ever felt a boo-boo?
Early Reader · Change the reading level on the articleHemostasis
Your body can stop bleeding. It works in three steps. First, the tiny tubes for blood get tight. Next, small parts in your blood stick together. Then, they turn into a thick gel. This helps you heal. Do you feel…
Early Reader · Change the reading level on the articleHemp
Hemp is a fast growing plant. It grows very quickly. We can use it to make many things. It makes rope and clothes. We can even eat the seeds. It helps our world too. Do you like wearing clothes made from plants?
Early Reader · Change the reading level on the articleHenrietta Lacks
A woman named Henrietta lived long ago. Doctors took some of her cells. These cells can grow and grow. They help us learn about health. They help make medicine for you. Do you like learning about science?
Early Reader · Change the reading level on the articleHenry Faulds
Henry was a doctor. He lived in Japan. He saw tiny lines on fingers. These lines are different for everyone. He used them to help people. Do you have tiny lines on your fingers?
Early Reader · Change the reading level on the articleHepatitis A
A tiny germ can make your liver sick. It can spread through dirty food or water. You can stay safe by washing your hands. A shot can also help you stay well. This helps you stay strong. Do you wash your hands often?
Early Reader · Change the reading level on the articleHepatitis B
A tiny germ can make you sick. It can hurt your liver. This is a part inside your body. You can get a shot to stay safe. Do you want to stay healthy?
Early Reader · Change the reading level on the articleHepatitis C
A tiny germ can hurt your liver. This germ lives inside the body. It can make you feel sick. It can also stay for a long time. Doctors have medicine to help. Can you stay healthy?
Early Reader · Change the reading level on the articleHepatitis C virus
A tiny germ can make people sick. It can hurt your liver. This germ is very, very small. It lives inside the body. It can change quickly. We must learn about it. Do you want to learn more?
Early Reader · Change the reading level on the articleHepatitis D
A tiny germ can hurt your liver. This germ needs another germ to live. It cannot work all by itself. This can make you feel very sick. We can stay safe with shots. Do you want to learn more?
Early Reader · Change the reading level on the articleHepatitis E
A tiny germ can make your liver sick. It can get in your body from bad water. It can also come from meat. Most people feel better soon. Does your body stay strong?
Early Reader · Change the reading level on the articleHepatology
Doctors study how your body works. They look at your liver. They look at your gut too. This helps keep you well. It is good to stay healthy. Do you eat good food?
Early Reader · Change the reading level on the articleHerbaceous plant
Some plants have soft green stems. They do not grow hard like trees. These plants stay low to the ground. They help make dew for the land. Many of them grow from seeds. Do you like to see green plants?
Early Reader · Change the reading level on the articleHerbert Needleman
Herbert was a doctor for kids. He studied how some bad stuff in the air and paint hurts us. He found out that lead can hurt a child's brain. He helped make the world safer. Now, many kids stay healthy. Do you want to…
Early Reader · Change the reading level on the articleHerbicide
Some things kill weeds. We use them on farms. They help our food grow well. They keep bad plants away. This is very helpful for us. Do you like gardens?
Early Reader · Change the reading level on the articleHercules beetle
The Hercules beetle is a very big bug. It lives in warm rain forests. Some have large horns on their heads. This bug can even fly! It is a very strong insect. Do you want to see one?
Early Reader · Change the reading level on the articleHerd
Some animals live in a big group. They move all at once. This helps them stay safe. It is hard for a hunter to pick one. They also help each other find food. Do you like being in a group?
Early Reader · Change the reading level on the articleHeritability
We look at why we are different. Some things come from our family. Other things come from where we live. This helps us learn about ourselves. Do you look like your mom or dad?
Early Reader · Change the reading level on the articleHermann Ebbinghaus
A man named Hermann studied memory. He wanted to know how we learn. He tested himself with silly sounds. He found that we forget things fast. This helps us learn better. Do you like to learn new things?
Early Reader · Change the reading level on the articleHermann Joseph Muller
Hermann was a man who studied life. He looked at tiny flies to learn. He found that special light can change them. This helps us stay safe today. He was a very smart helper. Do you like to learn about bugs?
Early Reader · Change the reading level on the articleHermit crab
A hermit crab lives in a shell. It finds an empty shell to stay safe. The shell protects its soft body. This shell is like a little house. It moves its house to new spots. Do you like to play in shells?
Early Reader · Change the reading level on the articleHernia
Sometimes the inside of your belly pushes out. It looks like a little bump. This can happen if the belly wall gets weak. It might feel a bit sore. Doctors can help fix it. Have you ever seen a bump like that?
Early Reader · Change the reading level on the articleHerpes esophagitis
A tiny germ can hurt your throat. It makes it hard to swallow food. It can also make your throat feel sore. This can happen to many people. We can use medicine to help. Do you feel better when you are sick?
Early Reader · Change the reading level on the articleHerpes simplex encephalitis
A tiny germ can get into the brain. This makes a person feel very sick. They may feel confused or get a fever. Doctors use medicine to help them. It is good to get help fast. Do you know how to stay well?
Early Reader · Change the reading level on the articleHerpes simplex keratitis
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Early Reader · Change the reading level on the articleHerpes simplex virus
Many people have a tiny germ. It can live in the skin. It may make small bumps. Most people do not feel sick. It is very common. Can you find it?
Early Reader · Change the reading level on the articleHerpesviridae
Tiny germs can live in our bodies. They can hide for a long time. Some germs make us feel sick. Most adults have had one. They stay very quiet inside us. Do you know about tiny germs?
Early Reader · Change the reading level on the articleHerpetic gingivostomatitis
A tiny germ can make your mouth sore. It can make your gums hurt. You might feel a fever too. It can be hard to eat or drink. We can help you feel better. Do you feel okay today?
Early Reader · Change the reading level on the articleHerpetic whitlow
A tiny germ can hurt your finger. It makes the skin red and puffy. It can make small bumps too. This can happen to kids or adults. It usually gets better on its own. Do you keep your hands clean?
Early Reader · Change the reading level on the articleHerpetology
Some people study small animals. They look at frogs and snakes. They also look at turtles. These animals help us learn about our world. It is very fun to watch them. Do you like snakes?
Early Reader · Change the reading level on the articleHerrerasaurus
This was a fast dinosaur. It lived a long time ago. It used its strong legs to run. It had sharp claws on its hands. It ate meat to stay strong. Do you think it was fast?
Early Reader · Change the reading level on the articleHerto Man
Long ago, people lived in Africa. We found their old bones. They lived near a big lake. They used stones to make tools. These people are like us. Do you like to look at old things?
Early Reader · Change the reading level on the articleHesperocyparis lusitanica
This is a tall green tree. It comes from Mexico. It can grow very high. The tree stays green all year. It can live with very little rain. It is a pretty tree to see. Do you like big trees?
Early Reader · Change the reading level on the articleHesperocyparis macrocarpa
This is a special tree. It lives by the sea. The wind makes it grow in funny shapes. Its green leaves smell like lemons. It is a very pretty tree. Do you like the smell of lemons?
Early Reader · Change the reading level on the articleHesperornis
This was a big bird. It lived in the sea. It had no wings. It used strong legs to swim. It had teeth in its mouth. Do you like birds that swim?
Early Reader · Change the reading level on the articleHeterocongrinae
Garden eels live in the sea. They hide in holes in the sand. They poke their heads out to eat. They look like grass in a garden. Many eels live in one group. It is fun to watch them. Do you like the ocean?
Early Reader · Change the reading level on the articleHeterodontosauridae
Some dinosaurs were small like a fox. They had long tails. They had big teeth like tusks. These dinosaurs ate plants or food. They lived a long time ago. Do you like dinosaurs?
Early Reader · Change the reading level on the articleHeterodontosaurus
This was a small dinosaur. It lived a long time ago. It had many kinds of teeth. Some teeth looked like long tusks. It could eat plants or meat. It was a busy little animal. Can you imagine seeing one?
Early Reader · Change the reading level on the articleHeteroptera
Some bugs have very special wings. Part of the wing is hard. The other part is soft. These bugs live on land and in water. They are fun to find! Can you spot a bug?
Early Reader · Change the reading level on the articleHeteropteryx
This is a big stick insect. It lives in the jungle. Some are green and some are yellow. They have spikes on their legs. This helps them stay safe. Do you like bugs?
Early Reader · Change the reading level on the articleHeterosis
Sometimes baby plants grow very strong. They get this from two different parents. This makes them grow fast. It also helps them grow more food. It is like a super boost! Can you find a strong plant?
Early Reader · Change the reading level on the articleHeterothermy
Some animals can change their heat. They stay warm when they move. They get cold when they rest. This helps them save their food. It is a smart way to live. Can you think of a cold animal?
Early Reader · Change the reading level on the articleHeterotroph
Some living things need to eat. They cannot make their own food. They eat plants or other animals. This helps them grow. Most animals are like this. Do you eat food to grow too?
Early Reader · Change the reading level on the articleHevea brasiliensis
This is a rubber tree. It grows in warm places. It has white juice inside. We use this juice to make rubber. It helps make things we use. Can you find a rubber toy?
Early Reader · Change the reading level on the articleHexactinellid
Glass sponges live in the deep sea. They have a hard body made of glass. They can be white or orange. Some live for a very long time. They help make reefs for other fish. Do you like the ocean?
Early Reader · Change the reading level on the articleHiccup
A hiccup is a little jump. It happens in your chest. Your body does it on its own. It can happen to people and pets. Most of the time, they go away fast. Have you ever had a hiccup?
Early Reader · Change the reading level on the article