Community structure is influenced by many factors, including abiotic factors, species interactions, level of disturbance, and keystone species, play particularly important roles in determining their communities’ structure.
It is definitely not a primary source: this would be a book itself.
Now, is it a tertiary source? I don't think so: the author of the review should have read the book and should only be referring to this book in the review.
I think it's a secondary source.
Answer:
A is the one
Explanation:
because if you look at it they come from groups and stuff
C. A vertebrate because a vertebrate animal has a backbone. :)
Hope this helps! ;)
