Often,
substrate.
will bind within an enzyme's active site and produce a unique active site for the
Click the answer you think is right.
cofactors
apoenzymes

Explanation:

Enzymes are biochemicals which catalyze a biochemical reaction taking place in the body by reducing the activation energy barriers and changing the substrate molecules to products.  

The active sites of enzymes first binds to the substrate and forms an enzyme-substrate complex.

An enzyme can work actively only with the help of helper molecules called co-factors and co-enzymes.  

Co-factors are non-protein inorganic ions like iron, magnesium which helps the catalyze chemical reactions.  

Cofactors are bound tightly with the active sites of the enzymes and also contribute for the structural integrity and stability of the enzyme

if the type of the food available changes, then the frequency of beak types will change, because birds with beaks more suited to the available food will be more successful over time.

answer: accepted answer: aquatic animals use the oxygen dissolved in water to carry out respiration. since the amount of dissolved oxygen in water is low as compared to the amount of oxygen in the air, therefore the rate of breathing in aquatic animals is much faster than it is in terrestrial animals.

explanation: