How to identify microscopically if the fracture is ductile or brittle?

One of the below is the weakening mechanism in metals 

The resistance to slip is greater when impurity atoms are present. 

For a given normal stress applied to a metal, the maximum shear stress depends on the maximum combination of cos λ multiplied by cos ϕ.

Which of the following is NOT a general survivorship curve pattern?

The minimum population required for the long term survival of a species is known as the carrying capacity

Which of the following is NOT considered a biological pest control method?

Provide remaining steps how slip occurs (i.e., yielding of metal) in a single crystal structure when the external force is applied. 1. Selection of slip plane 2. _______________________ 3. _______________________ 4. _______________________ 5. Slip occurred (metal yielded)

The general solution for non-steady state diffusion in based on 

Recrystallization temperature is the temperature of the metal at which the metal completes it recrystallization in