a testable answer to a scientific question

to make a guess that is based on observations

an explanation that is supported by the data and observations that scientists have

a group of parts that work together to do a job, perform a function, or produce a result

a part of a system that is its job or role within the system

an object, material, or idea that enters a system

something that happens in the a system that changes the inputs or parts of the system

an object, material, or idea that a system produces

a process in which the effects of a change in a part of the system help control that part of the system

a system into or out of which materials or energy does not flow

a system into or out of which materials or energy can flow

parts that rely on one another to function properly

shows the relationship between two quantities, written as X:Y of X/Y

objects or shapes that repeat in a certain way

a structural frame made of straight beams in the shape of a triangle

an event or process that repeats on a regular basis

the output of a system also acts as the input to control or regulate how the system functions

anything that represents an idea, object, system, or process

a tool for lifting heavy loads

the amount of matter in an object

tools for measuring small volumes of liquids

a tool for measuring the precise width of small objects

a tool for measuring wind speed

a tool for measuring air pressure

the marks on a tool that show the scale units

an experiment in which all conditions but one are kept the same

in an experiment, a group that has normal conditions or doesn't receive any experimental treatments, serves as a reference for other groups

in an experiment, a group for which scientists deliberately change one condition

the condition a scientist deliberately changes in an experiment

the condition that is affected by the independent variable

one round of an experiment

a graph that shows changes in one variable over time

a graph that shows parts of a whole, also sometimes called a pie chart

a graph that shows data from different categories

a relationship between two quantities in which both quantities change in the same way

a relationship between two quantities in which the quantities change in opposite ways

the application of scientific knowledge for human purposes

a microscopic particle that can replicate inside an organism's body and cause disease

the splitting of a nucleus of an atom

the joining of atomic particles in the nucleus of an atom

a force that acts between two objects that are touching each other, acts against motion

a process of grouping organisms by certain characteristics