system

All the physical parts of a person, animal, or plant

A group of connected body parts that do a specific job like digestion or breathing

A group of organs or body parts that work together to do one job

A group of organs and tissues that work together to do a job in the body

The process of moving apart or staying apart

A group, system, or organization loses order and stops working well

A sudden change in life or work that feels unpleasant and hard to handle

The Sun and the objects that move around it, like planets and moons

Part of the body that protects you from germs and disease

The group that runs schools for children from kindergarten to high school

A set of devices like cameras and sensors that warn about intruders

Software that controls a computer and lets other programs run

The people, groups, and laws that govern a country

A country's courts, officials, and rules that decide and enforce laws

A network of nerves that sends messages between the brain and body to control movement and feeling

A group of computers and software that work together to store and use data

Weapons and other equipment used to protect a country or area from attack

A group of machines and tools used together by the military to attack or defend

All the banks in a country that work together to manage money and payments

A system that keeps a machine or process working as it should

A set of ideas and values that shape how people think and act

A group of people who help and encourage you in hard times

A group of devices that warns you automatically about danger like fire or a break-in

The courts and judges who use laws to make fair decisions about cases

The way a country organizes how it makes, shares, and uses goods and services

Rules a government uses to set and collect taxes from people and businesses

A set of electronic devices that records, makes louder, or plays sound

A network of vehicles and routes that moves people or goods

A group of people with shared rules and roles for living together

The brain and spinal cord that control the body and mind

A way to send and receive information between people or machines

A group of parts that supply and carry electricity in a building, car, or area

A set of pipes and buildings that collect, clean, and send water to homes

A network of machines and wires that make and send electricity to homes and businesses

Electric trains that run under a city and carry many people

A set of ideas about what is right and wrong that guides a person or group

A group of devices that automatically steer a vehicle like a rocket or plane

A set of parts that remove heat to keep a machine or building cool

A group of cameras and devices that watch people or places for safety

Equipment that keeps a person alive by doing the body's most important jobs

A set of weapons and radar that find and stop enemy missiles before they hit

A group of fans and ducts that brings fresh air into a building and removes stale air

The parts of the body that break down food and take in nutrients

A group of parts that push a vehicle forward, like an engine

A set of rules for choosing leaders or deciding public issues

A system of underground pipes that carries dirty water from homes and streets

A set of tools and rules that help people in a company collect, store, and share records

The way a country supplies and manages money and how people measure its value

A system that sends voice over wires or the internet

A set of pipes and small nozzles that automatically spray water to put out fires

A way to put people or things into levels by how good they are

A system that warms a building by moving hot air or water

A network of main roads that carry cars and trucks between cities and regions

A way of putting papers or computer files in order so you can find them easily

A group of weapons designed to work together for military use

A set of rules for how votes are cast and counted to choose leaders

The central bank of the United States that controls money and checks banks

Organs that make sex cells and let people or animals have babies

A system that detects threats early, like missiles or storms, and sends alerts so people can act

A set of electronic equipment that plays recorded music through two speakers

A way of arranging and storing paper documents or computer data so you can find them

A system in courts where ordinary people decide if someone is guilty in a trial

A system of measurement using meters, kilograms, and seconds

Parts of the body that take in oxygen and remove carbon dioxide when you breathe

A television service that sends channels to homes through wires

A set of computers and networks that store, send, and manage an organization's information

Affecting every part of a system, not just one part

A way of putting two people together so they help and keep each other safe

A social order where people stay in the group they are born into for life

A system where people trust each other to be honest without being watched

A set of loud electronic speakers that plays announcements in public places

A part of a car or plane that stores and gives fuel to the engine

A system of laws that gives inventors the only right to make, use, or sell an invention for a time

Organs and blood vessels, including the heart, that move blood and a clear fluid called lymph around the body

A set of tools that shows a ship's or plane's position and direction on a map

A system that uses satellites to find the exact position of a device on Earth

A way to let people talk to each other using phones when far apart

A method of adding or removing points to judge performance

A set of programs that work together on a computer to do a job

A way to record and track a business's money and payments