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Because light travels in a straight line and casts a shadow, Isaac Newton hypothesized that light is
A. radiation.
B. a stream of particles.
C. a wave.
D. heat.

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RASEA23
B. A stream of particles, or otherwise known as photons, small pieces of light. All of the rest of the options could never make a shadow. 
kaileyr172001

B. a stream of particles.

hope this helps

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