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1.The earliest evidence of silk was found at
the sites of Yangshao culture in Xia County,
Shanxi, where a silk cocoon was found cut
in half by a sharp knife, dating back to
between 4000 and 3000 BC. The species
was identified as Bombyx mori, the
domesticated silkworm.
False
2.Digestion is considered a physical and chemical change because enzymes in the stomach and intestines break down large macromolecules into simpler molecules so that the body can more easily absorb the food.
False
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