HELPDifferent chemical elements have different properties, and this is determined by their atomic structure. Look at the two atoms in the image. Helium is a gas at room temperature while lithium is a solid metal. Compare and contrast the atomic structures of the two atoms.

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you must remain stopped until the stop signal is retracted and the red lights are turned off. approaching traffic in the opposite roadway of a divided highway shall not be required to stop, even if the school bus has the stop-arm extended and the alternately flashing warning signal lamps on.

in 1859, charles darwin set out his theory of evolution by natural selection as an explanation for adaptation and speciation. he defined natural selection as the "principle by which each slight variation [of a trait], if useful, is preserved".