1) One SC problem per thread please.
2) You should ask a question, not just post a problem.
3) There's an existing thread on the third question you mentioned:
unlike-most-warbler-species-t4296.html.
4) When you repost the other problems, please confirm that they are GMATPrep questions. They read as though they're real GMAT questions, but I'd like their provenance. We can't answer questions from such sources as 1000SCs. In fact, if I were confident in their provenance, I would divide this into two new threads and answer the questions now, as they look like fun examples.