An ​ (a)   can kill a bacterial infection, but will not work on a virus.

1. Penicillin is an ​ (a)   that has saved many lives.

1. Orange peels, paper, and wool clothing are ​ (a)   materials that decompose over time.

1. Even ​ (a)   items take a long time to fully break down, so reduce and reuse first.

1. We should use ​ (a)   containers for our lunches so they decompose naturally instead of polluting the environment.

1. My ​ (a)   project for history class is about Rosa Parks' life.

1. I learned a lot of interesting details about Helen Keller's early life by reading her ​ (a)   for my book report.

1. The ​ (a)   describes how Walt Disney's challenging childhood and early failures helped him develop the Disney company.

1. Used medical supplies like syringes and bandages have to be disposed of in special red ​ (a)   bags so they don't spread diseases.

1. The crew of the spaceship opened the storage container marked "​ (a)   " very carefully in case there was anything inside that could infect them or make them ill.

1. Lab researchers wear gowns, gloves, and masks while working to protect themselves from chemicals that could be ​ (a)   .

1. In science class, we discuss how to handle samples of mold, bacteria, and other possible ​ (a)   very carefully so that students don't get contaminated.

1. ​ (a)   is the science that studies living organisms, like plants, animals, and the human body.

1. In our ​ (a)   textbook, we can learn about cells, ecosystems, and the processes of living things.

1. Understanding ​ (a)   helps explain things we observe in nature, like why leaves change color or how birds build nests.

1. In our ​ (a)   lesson, we learned about emotions and why people sometimes act differently when they are happy, sad, angry, or afraid.

1. ​ (a)   is the study of the human mind and behaviors controlling how people think, feel and act.

1. Learning ​ (a)   gives insights into why different personality types process emotions differently.

1. We are doing an experiment in ​ (a)   class where we observe how praise versus criticism affects people's motivation and achievement.

1. Our school ​ (a)   helps students who are struggling with learning or personal problems.

1. My friend met with a ​ (a)   to talk about why she gets worried a lot and has trouble sleeping.

1. The ​ (a)   taught us how our brains develop as we grow and how we learn to control our emotions better as we get older.

​ ​ (a)   is a fear of small, enclosed, or tight spaces that makes someone feel very anxious or panicked.

1. My friend Hannah has ​ (a)   , so she always feels uneasy and needs to leave places like crowded elevators or tiny rooms.

1. The ​ (a)   caused him to start breathing heavily and sweating when he was inside a cave.

1. A ​ (a)   is a person who has an intense fear of small spaces or being in enclosed areas.

1. My uncle is a severe ​ (a)   , so he never feels comfortable in places like crowded elevators or compact cars.

1. The ​ (a)   started shaking and hyperventilating when he entered the tiny bathroom on the airplane.

1. ​ (a)   is an extreme fear of water that causes people to panic or have anxious feelings around it.​

1. My friend Paul has ​ (a)   ever since almost drowning when he was little, making activities like swimming terrifying for him.

1. People with ​ (a)   may go to great lengths to avoid coming into contact with water.

​ ​ (a)   is a word used to describe prejudice and discrimination against Jewish people.

1. Nazis spread dangerous propaganda in the 1930's that promoted hateful ​ (a)   against Germany's Jewish population.

1. Throughout history, ​ (a)   has led to unfair treatment of Jewish people, like not allowing them into schools or making them live in certain neighborhoods.

1. Making offensive jokes about Jews, vandalizing synagogues, and denying rights to Jewish people are also examples of ​ (a)   .

1. The ​ (a)   refers to the genocide and mass killing of over 6 million Jewish people by the Nazi regime in Germany before and during World War II.

1. We study the painful history of the ​ (a)   so we remember the victims and make sure nothing so horrible ever happens again.

1. During the ​ (a)   , Jews and other groups like Roma people, disabled people, Polish civilians, and political enemies were sent to concentration camps.

1. An ​ (a)   is an extremely powerful weapon that gets its explosive force from splitting tiny atoms.

1. Scientists first developed an ​ (a)   in secret labs during World War II through a program called the Manhattan Project.

1. When an ​ (a)   goes off, the blast, heat, and radiation it releases can destroy entire cities and kill many people.

1. Technological innovations like radar, rockets, jets, and the atomic bomb shaped fighting strategies throughout ​ (a)   until the Axis powers surrendered in 1945.

1. ​ (a)   was a major war that began in 1939 and lasted until 1945, involving many of the world's countries.

The United States tried to remain neutral during ​ (a)   but eventually became involved after the Japanese attack on Pearl Harbor in 1941.

1. Towards the end of ​ (a)   , the United States dropped two atomic bombs on Japan which caused them to finally surrender and marked the war’s devastating conclusion.

1. ​ (a)   lasted for 6 years and caused massive destruction as over 60 million soldiers and civilians were killed worldwide.

1. ​ (a)   is when a group of people target and kill members of a certain culture, ethnicity, or religion with the goal of destroying them.

1. More recent examples of ​ (a)   some kids my age may have heard about are those in Rwanda, Darfur, and Bosnia in the 1990s when many innocent people died.

1. Acts of ​ (a)   are often brought about by governments that blame specific groups of innocent people for a country’s problems.