How can you identify the dependent and independent variables in following cases?

Well to I don't know what you mean by in the following cases but, a dependent variable is the variable being tested and measured and also relies on the independent. While on the other hand the independent variable is the variable that is being changed or controlled.

the answer is "a.) well–developed vascular system."

explanation:

feral cats are estimated to eat tens of millions of native animals each night in australia