Describe the process of black boxing of silkworm eggs.

By around 8th or 9th day from the day of laying, the embryos develop the eye spots which are visible as a black spot on the eggs. With the development of the eye spots, the embryos become ______ _____ ________ __________ _____ _______ ___ _________ ______ ________ ____ ____.
_____ _________ _______ __________ ______ ___ _____.
__________ ____ _____ __________ ______ ____ ____ ____ __________ _______ ________.
_______ _______ ___ ____ _______ _________ _________ _________ _____ ________ ___.
_________ _________ ______ _______ _____ __________ ___ _____ ________.
__________ ____ _______ _____ _____ _____ ____ ____ ___ ______ ________.
____ ______ _______ ___ _______ ___ ______ _________ __________.
_______ _______ ______ _______ __________.
______ _____ _________ _______ _________ _______ ______ _______.
__________ _______ ____ ___ _________ _______ ___ _______ ___.
____ __________ _________ ________ ___ ____ ________ _______.
__________ _____ ________ ________ ____ ________.
_____ ______ ________ _____ _____.
__________ ________ ____ _______ _____ _______ ______ __________ __________ __________.
__________ ______ _______ _________ ________ ________ __________ ______ _________ ______ _____.
_____ _______ ___ ____ ____ _____ ____ ________ _____ __________.
_______ __________ _________ __________ ________ _____ ____.
_________ ______ ________.
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