Twins in Space (U1 W3)

Front

identical

Back

appearing to be exactly the same

Front

radiation

Back

energy that travels in the form of waves outward from a source, such as the sun

Front

duplicate

Back

exactly the same as another

Front

comparison

Back

examination of things to see how they are similar

Front

DNA

Back

the substance in cells that determines the characteristics of a living thing

Front

chromosomes

Back

parts of DNA in cells that contain the genes