There is a question in one of the LSATs which takes the following two sentences as interchangeable:
(1) Disturbed habitats are most vulnerable to new arrivals.
(2) New species primarily threatens disturbed areas.
I am very confused because (1) only states the vulnerability of disturbed habitats; I can't see how influential new species are. On the other hand, (2) only talks about new species' impact but nothing about the vulnerability of the habitats.
I would really appreciate your help if you could help explain how those two sentences can be interchangeable.
Thank you very much, Leon