To obtain oxygen from their environments mollusks and crustaceans use which organs

The mantle creates a small empty space called a mantle cavity, which is modified for different functions in different groups of mollusks. Within the mantle cavity hang the gills, highly complex and greatly folded sheets of tissue. Gills are used to exchange oxygen and carbon dioxide in respiration

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gametes or germ cells are haploid cells (example: sperm and ova) containing only one set (or n) number of chromosomes and autosomal or somatic cells are diploid cells containing 2n number of chromosomes.

colors do exist. the color of the sky is actually violet; humans percieve the color of the sky as blue.