Energy requiring reactions can occur in biological systems because enzymes allow their coupling to other reactions with

Energy requiring reactions can occur in biological systems because enzymes allow their coupling to other reactions with products of lower free energy than the reactants

Explanation:

Reactions which release energy are exergonic reactions and those that require energy are endergonic reactions. Exergonic reactions are with negative ∆G where the free energy (ability to do a work) of the products is lesser than the free energy of the reactants of the reaction.  

To utilize the energy that is released during exergonic reactions, endergonic reactions couple with exergonic reactions in biological systems.

Exergonic reactions are spontaneous and can be coupled with endergonic reactions because their equilibrium constant remains greater than 1.  

materials water oxygen those are the things i can think of in this moment.

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.