Which of the following is an example of how seeds of plants can be spread to new areas by nonliving parts of an ecosystem?

I'm not sure what the options are but if the water-cycle/evaporation is an option I'd go with that as plant seeds and such can be picked up and moved via the water cycle or rain. For example the flow of a stream carrying a seed to the edge of a lake.

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