2>right
3> Killer whale is the subject, 'which' is redundant.Just redundant, but still can be right.
1>wrong."it is famous for its aggressive"...is a complete sentence, however "which can grow to be.."is used to modify killer whale, is a Subordinate Clause. U cannot connect both of them just by adding"and".
If U wanna remain"it",at least, u should seperate the sentence, add a comma before" and it is.." however it is still awkward. "It" may has no CLEAR reference. U cannot point out that it refers to killer whale quickly.
-- by 会员 Gail小M (2011/4/10 11:53:44)