A majority of thermoplastics exhibit two particular mechanical behaviors. refers to the non-linear relationship between stress and strain for most parts of the stress strain curve. refers to how both elastic and plastic deformations occur when an external force is applied to a thermoplastic polymer. a. Non-Newtonian behavior, Viscoelastic behaviorb. Viscoelastic behavior, Crystallization formation behaviorc. Glass transition behavior, Crystallization formation behaviord. Glass transition behavior, Non-Newtonian behavior

A. Non-Newtonian behavior and Viscoelastic behavior

Explanation:

- Non-Newtonian = A non-Newtonian fluid is a fluid whose viscosity is variable based on applied stress or force.

- Viscoelastic behavior =  is a combination of elastic and viscous behaviour where the applied stress results in an instantaneous elastic strain followed by a viscous, time-dependent strain.

- Crystallization = The phase transition can be defined as the formation of a bubble or crystal from a liquid.

- Glass transition =  is the gradual and reversible transition in amorphous materials (or in amorphous regions within semicrystalline materials) from a hard and relatively brittle "glassy" state into a viscous or rubbery state as the temperature is increased.

-- Looking at these definitions I feel that only the ones I chose fit correctly with the question. Please let me know if I am correct.

i'm pretty sure its b i might be wrong though!

a is the correct answer