This is a classic case of “use it or lose it” evolution. As all organisms evolve, they undergo changes by shedding what they no longer need (due to developmental and environmental changes, such as shifts in climate) and develop new, adaptive genetic tools for survival. Over the (very) long course of human evolution,we have lost most of our body hair simply because we didn’t need it. What remains are eyebrows, which still come in handy because they shield our eyes from sweat, as well as facial and pubic hair, which likely remain for the sake of mate selection and attraction. Ever wonder why we get goosebumps? There used to be hair there, which would stand up for one of two reasons, depending on the situation: 1) to shield us from cold), or 2) to intimidate enemies and predators (if you’re not sure what this means, think about what two cats look like just before they fight).
There are plenty of other things we don’t need, like the appendix. Perhaps someday our bodies will evolve until the appendix fades from our DNA completely.
Exactly. When dealing with evolution, nearly all creatures are the way they are because it is beneficial and key to their survival. Traits that are not benefical to survival, or in fact harmful, do not get carried on in the gene pool. While some species have useless appendages, no species pass on negative traits as those negative traits cause them to die before they can reproduce and pass on the genes.
Click here to cancel reply.
Sorry,At this time user registration is disabled. We will open registration soon!
Don't have an account? Click Here to Signup
© Copyright GreenAnswers.com LLC