(a) The band of 7 colours (violet, indigo, blue, green, yellow, orange & red) is known as spectrum.
(b) A form of printmaking where the image can only be made once is known as monoprinting.
(c) A prototype is an early sample, model, or release of a product built to test a concept or process.
(d) Choreography is the art of composing steps for a dance.
________
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Answer:
<u><em>The answer is</em></u>: <u>B) astronomical phenomena
.</u>
Explanation:
The enigma of Stonehenge, the first astronomical observatory.
The word megalithic literally means "<u>big stone</u>" and the culture named by this name would have spread since the end of the Neolithic.
Stonehenge, literally "<u>Circle of stones</u>."
<u>Although the researchers play with three possibilities</u>, it was concluded that the stones indicated twelve different positions of the Sun and the Moon, which allowed to predict eclipses, which is why it was considered a true astronomical observatory.
<u><em>The answer is</em></u>: <u>B) astronomical phenomena
.</u>
