Living in herd is a structural adaptation.
There are three different kinds of adaptations: behavioural, physiological and structural.
Adaptations help animals survive and their ecosystem.
The second sentence does not sound correct but it seems correct to me (just not in grammar).
Hope it helped!
They absorb food from their environment and release ammonia into their environment through their body surface because their body is very flat, due to the lack of coelom
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It will become a manonamer organism
Eco1: 1, 4
Eco2: 2, 3, 5
Eco3: 6