If incineration causes an object to combust, then what causes an object to combust? Answer choices: - heating liquids - friction - It gets heated up - incineration - heat energy - flow of electrons - Electrical energy - Energy.
incineration

If vertebrates have a complete digestive system and a closed circulatory system, then vertebrates have a complete digestive system and a what? Answer choices: - Veins and arteries. - lack of backbone - bruised brain stem - critical organs - closed circulatory system - incomplete circulatory system - characteristics - sensory neurons
closed circulatory system

If magnetism can cause copper to be attracted, then what can attract copper? Answer choices: - photons - colors - Energy. - magnetism - flowers - hormones - Light - electrically
magnetism