How is silk thread obtained
from the silkworm
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Extracting raw silk starts by cultivating the silkworms on mulberry leaves. Once the worms start pupating in their cocoons, these are dissolved in boiling water in order for individual long fibres to be extracted and fed into the spinning reel.

Explanation:

It's pretty cool to watch if you have the chance to.

the correct answer is:

a population changes in response to a change in the environment.