D, perspiration (which is also known as sweating).
Hope that helped :)
Effective communication is obviously influenced by different fators among which we can surely include acceptance of responsibility. You have to consider that when someone is taking responsibility for his actions this will make the person who he's talking to view him more favourably, as a more responsible person and perhaps even as someone who wants to sensibely solve problems.
600 calories, hope that helps
decline, ( depends on what you are talking about, i'm thinking more like women are getting less and less populated)