I guess we can't survive without our ecosystem and other creatures and apparently aliens killed everything that made sound so... I have no idea how they survived this far...
Their weakness was hearing issues from the beginning that they can't stand hi pitch or screeching sounds dua ti their hearing vulnerability...
When u r having such a tough life why wud u take the risk of extending it family?
When u r always cautious and u have already sustained loss of a child how do u manage to leave the nail on the stairs?
When u know u r at the end of ur pregnant days how do u spend till sundown at the open house?
It is an amazing movie though and the actors played their roles marvelously ..