Latin is used for the scientific names of plants and animals.
For animals: organism
Yes, they have.
On google just look up scientific names for plants and animals it works just try it.
Scientific names are important for two reasons. (1) There are so many species of animals in the world that scientific names are the one unique name for that one unique species and (2) through scientific names, you can see how the different species of animals are related. Black squirrels and red squirrels aren't the same species, but they're related and their scientific names reflect this.
scientific name of onion