Answer:
It can be decided as follows.Step-by-step explanation:
During El Nino, Trade winds become weaker. Warm water is pushed back east, towards the west coast.. When upwelling weakes or stops altogether, it is an indication of El Nino. Without nutrients from the deep, there are fewer phytoplankton off the coast. While during la Nina , winter temperature are warmer than normal in the south and cooler than normal in the north. It leads to a more severe Hurricane season.This environment support s the marine life. It can be said on the basis of temperature of water it can be decided.