Question

does your digestive system need enzymes to help it break down food?
yes
no
maybe
the enzyme salivary amylase will act on starch (complex sugar) but not on protein. this action illustrates the salivary amylase..
contains starch.
is chemically specific.
is not reusable.
lacks protein

Explanation:

Enzymes are essential for the digestive system to break down food. Salivary amylase acts on starch but not protein, which shows its chemical specificity. Enzymes are proteins (so it doesn't lack protein), they are reusable (so it's not non - reusable), and the enzyme itself doesn't contain starch (the substrate is starch).

Answer:

For the first question: Yes.
For the second question: is chemically specific.