Is the ability to produce whatever volume the customer needs. answer correct changeover flexibility volume flexibility mix flexibility flexibility

The correct answer is volume flexibility.  

Volume flexibility refers to the tendency to generate below/above the fixed capability for a product, under the endogenous pricing in a two-product setting. It has been found that the value of volume flexibility is a function of demand correlation amongst the products, a consequence, which cannot be illustrated by classical risk-pooling opinions.  

Additionally, the value of product flexibility always reduces in demand correlation, and the value of volume flexibility can decrease or increase in demand correlation on the basis of whether the products are strategic substitutes or complements.  

enzymes loose their form in both unsuitable ph and temprature.

Explanation:

at very high tempratures enzyme molecules denatures due to high speed movements, at low tempratures enzymes works too slow to be useful enough.

low ph solotions contain lot of H+  and high ph solutions have few H+ , and the number of these H+ ions have polar effects on enzymes.  some Enzymes like pepsin works perfect in acidic environment ( ph=2)  while others might work at  high ph  or average ph( like Trypsin  works well at ph=7).