The enzyme salivary amylase will act on starch but not on protein. this action illustrates that salivary amylase
1) contains starch
2) is chemically specific
3) is not reusable
4) lacks protein

2) is chemically specific

Explanation:

Enzymes are organic catalysts which speed up or control chemical reactions in cells. Enzymes are specific in the reactions they catalyze. An enzyme will only catalyze one specific reaction or a group of closely related reaction. Enzyme salivary amylase found in the mouth only hydrolyses starch into maltose.

in 1859, charles darwin set out his theory of evolution by natural selection as an explanation for adaptation and speciation. he defined natural selection as the "principle by which each slight variation [of a trait], if useful, is preserved".

a unit of heredity that is transferred from a parent to offspring and is held to determine some characteristic of the offspring.