Answer: a hydrosphere is a sphere of water in which the water cycle operates in a systemic matter so i guess you couold include the way it operates is in a systemic manner.
They use it as a defense because if they are being hunted by a predator, they will use a certain light pattern to alert any larger predators to get whatever is hunting them.
Answer:
Hoover, Irondale, and Fairfield
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<span>They prospered through trade. The sea was dangerous to their wealth and survival. The Minoans were involved in the tin trade, dangerous in the Bronze Age. Tin, alloyed with copper which may have come from Cyprus, was used to make bronze. They dealt in saffron reaped from a kind of crocus.</span>