The main prey for the frogs in a certain pond are dragonflies. if the number of dragonflies is greatly reduced because of pesticide usage, how could the frogs adapt in order to survive?

Frogs would start eating some other kind of insect or else they would migrate to some other place.

Explanation: The population of frog is dependent on the dragonflies for their food and if the number of dragon flies are reduced due to the effect of pesticides then there are two options available for the frog.

First, the frogs can shift their preferences from dragon flies to some other insect.

Secondly, the frogs can migrate to some other place to fulfill the need of food.

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