Distinguish between primitive traits and primitive species.
Many biologists refer to amphibians as primitive vertebrates and mammals as advanced vertebrates.
As a result, structurally complex species are sometimes considered more advanced, evolutionarily, than are structurally primitive organisms. Give at least two problems with this viewpoint, from an evolutionary perspective. As a result, the population changes such that all individuals have long hair. It is more likely to survive as a result. In an area of scarce food, individuals who hoard food are more likely to survive, and over time hoarding behavior becomes more common until all individuals hoard food and survive better.