What is the relationship between enzyme activity and 3d shape of an enzyme

The reaction catalyzed by an enzyme is very specific. Most enzymes are proteins with unique three-dimensional configurations based on their amino acid sequence. The specificity of an enzyme can be attributed to the compatibility between the shape of the enzyme's active site and the shape of the substrate

if your own plato the answer is b. the fern transitioned from sporophyte generation to gametophyte generation.