Which question about dogs could be answered through scientific investigation

How fast does an Australian terrier grow? is a dog question that could be answered scientifically because growth can become a dependent variable that can be influenced by independent variables such as food, water, habits, and others.

Explanation:

in 1859, charles darwin set out his theory of evolution by natural selection as an explanation for adaptation and speciation. he defined natural selection as the "principle by which each slight variation [of a trait], if useful, is preserved".