Cope's Rule, often discussed in the context of evolutionary biology, is best described by which of the following statements?
1
It states that animals within a population tend to evolve to smaller sizes over time.
2
It states that, over evolutionary time, the body sizes of certain groups of animals may increase.
3
It emphasizes the tendency of species to maintain a constant body size throughout their evolutionary history.
4
It suggests that species will exhibit an increase in complexity as they evolve.