Each level of the food chain is a trophic level. hope this helps and i'm not too late!
To be honest I think it is B. Static Stretch is used to stretch muscles when the body is at rest.
Amylase is an enzyme, which are protein molecules that help in the breakdown of complex substances. Enzymes have optimum conditions in which they operate, which also include specific pH ranges. The pH in the stomach is too low for amylase to work in, so amylase is denatured and does not perform its function in the stomach.
The other organ producing amylase is the pancreas.
Mutations in the HTT gene cause Huntington disease. Hope that helps