In what way is the pteridophytes similar to spermatophyte

Both of them are free-living, the sporophytic generation being the maximum of their life cycle. Both of them have xylem and phloem tissues as their conducting tissues. Both of their bodies are differentiated into stem leaves and roots

the answer is "a.) well–developed vascular system."

explanation:

enzyme active site and substrate specificity

enzymes bind with chemical reactants called substrates. there may be one or more substrates for each type of enzyme, depending on the particular chemical reaction. in some reactions, a single-reactant substrate is broken down into multiple products