It provided people with 1 of their most basic needs, a dependable supply of food
The ability to blend into the surrounding environment can come in handy when trying to avoid a predator, especially for those animals with little else in their defense arsenal.
From my knowledge I mostly think its Thalilacea
I think this because even though it can be Appendicularia too, Thalilacea has BOTH a tail and notochord in the adult stage
Dinking, Breathing, Digesting.
Did this help