What would happen without it?
Fish oil can be used in soap making.
Many oils come from fish and whales. Without sealife people wouldn't get certain perfumes
In conclusion, sealife is used by you almost every day
Needed for Life
What would life today be like if fish and sealife had gone extinct in the past?
Many ancient coastal civilizations like the Norte Chico would die out.
And since there are many useful oils that come from fish and whales, we wouldn't have the first oil lamps. Or some kinds of medicines.
Sealife Helps Sealife
Without small fish many larger things would die out.