Describing Key Innovations in Engineering Choose the word or phrase that best completes each sentence.
Romans dj-veloped
v which allowed engineers to build complex structures and roads.
Romans supplied water to their cities by building
Roman engineers invented the world's first
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a  solution  is always transparent, light passes through with no scattering from solute particles which are molecule in size. the  solution  is homogeneous and does not settle out. a colloid is intermediate between asolution  and a  suspension. while asuspension  will separate out a colloid will not.

i don't see a text, but i am gonna assume this *orbit* the curved path, usually elliptical, described by a planet, satellite, spaceship, etc., around a celestial body, as the sun.