Practice Words: Science


atom
noun
a very small part of all things; the smallest part of an element that can join with parts of other elements
bacteria
noun
living things that are one cell and can be seen only through a microscope; some cause disease
cell
noun
a small mass of living material that is part of all plants and animals
compound
noun
a substance containing two or more elements
electron
noun
a small part of an atom that has an electrical force
element
noun
one of more than 100 substances known to science that cannot be separated into other substances
genes
noun
parts of cells that control the growth and development of living things; genes from the mother and father are passed to the child
genetic engineering
noun
the science of changing the genes of a living organism
gravity
noun
the force that pulls things toward the center of the earth
laser
noun
an instrument that makes a thin, powerful light
magnet
noun
a piece of iron or other material that has a pulling force; this pulling force is called magnetism
molecule
noun
the smallest amount of a chemical substance that can exist
nerve
noun
a thin piece of tissue that sends information through the body to and from the brain
organ
noun
a part of the body that has a special purpose, such as the heart or brain
organism
noun
a living thing such as an animal, plant, or human
particle
noun
a very small piece of matter
virus
noun
a kind of organism that causes disease
x-rays
noun
a kind of radiation that can pass through most solid materials, often used in medicine