Because with maps they knew where to go , without them they will be lost
Dark matter makes up about 27% of the universe.
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Answer:
The El Niño phenomenon.
Explanation:
The ENSO weather phenomenon consists of 3 stages. El Niño (very warm currents of water, La Niña(very cool currents of water) and Neutral, that can occur from autumn to spring next year in the pacific ocean between South America and Australia. In a severe warm phase ( known as El niño stage) is when fisheries' productivity decreases due to warm waters arriving the west coast and lowering the quality of the fish.
