Which two biological processes account for this difference between the puppies? meiosis and recombinationmeiosis and cloningmitosis and differentiationmitosis and cloning?

The biological processes that account for the difference is Meiosis and recombination.
Meiosis ensures that all organisms produced through asexual reproduction contain the correct number of chromosomes and also produces genetic variation by the process of recombination. This happens during meiosis 1 where cross over or recombination takes place, genetic material is exchanged between non sister chromosomes. Cross over creates new combinations of genes in the gametes that are not found in either parent, causing genetic diversity. 

We can plant more trees and plants.