They're helpful because they are the most sociable/playfulness creatures in the bays ever. They sense when people are in trouble easily and most of the time they will save a human from danger due to their huge mind of intelligence.
The dolphin
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humans
They tickle it
sharks and humans
nets boats and humans
Humans are animals. If you meant what is the smartest animal besides humans, it is the dolphin and the elephant.
monerans are helpful to humans because it is bacteria and bacteria helps humans by making milk yogurt
yes,humans
yes
Humans can be predators of any species. If you kill the dolphin you are a predator
An aolovera plant is helpful