One of the fossilized organisms discovered in the burgess shake called pikaia. Why is it believed to be one of the earliest ancestors of all vertebrae animals?
3 different types of movements in lemurs
Occasionally develop some things in wrk g places
Humans are perceived as an advanced species, but how many times have we stopped to consider that we owe this to evolutionary selection “brakes” on age development? Scientific research indicates that some of our most important human characteristics such as our large heads, which lend us our high intelligence, actually stem from retention of juvenile characteristics . The rounded features of human faces with “beautiful” features of many human females and “handsome” male traits also originate from selection pressure for this effect, known as “ neotony ”. The most remarkable case of neotony in other species is the Axolotl salamander, which is a subspecies of Tiger Salamander that remains a tadpole for its entire life.
In the sexual evolution of social species, a variety of indicators such as antlers have evolved to showcase the fitness of an individual to reproduce. For most mammals, including our close relative, the Chimpanzee, the penis is simply a practical reproductive organ.
As a result of walking upright, humans were less exposed to the sun, which prevented the back from being burned. The benefit of rapid cooling outweighed the costs of heat or even moderate cold exposure. Interestingly, humans became naked through thinning of hairs, and not a reduction in follicle numbers.
Early humans who developed color vision were at an advantage due to their ability to more rapidly size up other humans and either avoid deadly fights, or take advantage of mating opportunities. 8. Hair on Head. We have heard the phrase “and not a hair of your head will be harmed.
Confronted with an uncomfortable situation, we may make our best effort to deceive, but unfortunately for us, centuries of socially driven evolution may be giving us away. Scientific studies have shown that blushing serves to mitigate hostile responses by communica ting that the subject is ashamed or apologetic. In a series of tests, sympathy was elicited in the majority of test subjects when the illicit individual blushed, compared to those who were icy cool.
We would be likely to conclude that human movement out of forests and into grassland regions, the ability to stand upright highly useful as a means to scan the long distances for potential meals and threats. In addition, standing upright compensates for a lack of trees to climb for perspective.
Scientists have theorized that humans developed the chin as a sort of buttress to brace the jaw and allow it to retain strength while becoming relatively much smaller. Sexual selection is also believed to have played a role, with good jawlines being a signal of strength. 6. Lifting Feet when Scared.