This function returned all the non-leaf GO-terms on a particular GO MF level that are not. The supported
organisms are "Homo sapiens / Human", "Rattus norvegicus / Rat", "Mus musculus / Mouse", "Danio rerio / Zebrafish",
"Caenorhabditis elegans / Worm" ,"Arabidopsis thaliana / Cress", "Saccharomyces cerevisiae / Yeast",
"Schizosaccharomyces pombe / Fission yeast", "Drosophila melanogaster / Fruit fly", "Escherichia coli / E.coli".