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!
Answer:
abiotic and biotic
Explanation:
the abiotic components of any ecosystem are properties os the environment
The atomic number where as the atomic mass refers to the number of both neutrons and protons and the symbol refers to the element
I am not sure but here is a link to help you :)
https://www.ncbi.nlm.nih.gov/pubmed/22322095