Answer:
Variation observed between different inbred strains reared in a constant or homogeneous environment are often times caused by genetic factors, while variation observed among members of the same inbred strain reared under varying environmental conditions would likely be caused by nongenetic factors.
These Non-genetic factors transfers the parental phenotype or environmental components that causes variation in gene expression during offspring development.
Examples of the non genetic factors are the constituents that make up the ancestral environment which plays a role in variation among the offspring.
The graph shows an increasing trend in glacier ice loss with advancing years. This could be hypothesized to be as a result of increased global temperatures that are melting the ice. Melting of the ice also causes an increase in the ocean levels. This phenomenon is referred to as global warming.
