When looking at the learning tag, three questions are regarding the learning of biology as a science whereas one is using learning in the ethology sense. Clearly these two should be split up but which tag should take preference - self learning the field of biology or learning in a biological sense?
Using learning for questions about resources for learning is pretty much using it as a meta tag. That is discouraged on all SE sites. There is not much use for such a tag, it is far better to tag those questions with the specific topic they are about, e.g. cell-biology.
I removed all those instances of the tag and replaced them with something more useful.
$\begingroup$ Instead of learning we should encourange the use of homework in the questions tagetting the basic concepts of biology. $\endgroup$ Jan 12, 2012 at 16:17
2$\begingroup$ @Alexander I would interpret homework as denoting something quite different. I agree with MadSci that having a tag that means "I want to learn" is pointless. $\endgroup$ Jan 13, 2012 at 11:50
$\begingroup$ @AlexanderGalkin At math.SE, homework means that the asker is looking for hints and help rather than a straight solution. $\endgroup$– user24Jan 15, 2012 at 13:04