the relationships are probably mutual or parasitic
Explanation:
The argument of most scientists when it comes to commensalism is that the likelihood of a relationship between two different organisms, where one of the organisms to be completely unaffected is low. They propose that their relationship, although not obvious, is more likely to be mutualistic or parasitic at best.
The answer would be D. Shrubs, fungi, insects, and bacteria. Shrubs and fungi are definitely main decomposers and insects and bacteria do consume dead matter and waste so they also count as decomposers.
When amylase breaks down starch they form simple sugars, or disaccharides and trisaccharides which are converted by other enzymes to glucose to supply the body with energy.