 The island has been invaded by some algae , some of which are now well established . For example : 
 The island <a href='been_done' title='1'><mark>has</mark></a> been invaded by some algae , some of which <a href='drop_aux' title='2'><mark>are</mark></a>now well established . For example : 
The island done been invaded by sum algae , ssumof which now well established . fa example :