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a group of similar cells that work together to perform a specific job in the body


a combination of two or more tissues that work together to perform a specific function

organ system

a group of organs working together to perform body functions


anything that can independently carry out life processes


made of a single cell


made of many cells


a group of individuals of the same species that live together in the same area at the same time


all of the populations of different species that live and interact in an area


a community of organisms and their non-living environment

heart, leaf, stomach

examples of organs

simple microscope

a microscope that contains only one lens


the basic unit of living things

compound microscope

uses more than one lens to magnify an object


the ability to distinguish individual parts

convex lens

a lens that is thicker in the center that at the edges

electron microscope

uses a beam of electrons instead of light to create a magnified image


making an object appear larger than it really is

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