Search results
Results from the WOW.Com Content Network
On a longer timescale, animals like the Arctic hare, Arctic fox, stoat, and rock ptarmigan have snow camouflage, changing their coat colour (by moulting and growing new fur or feathers) from brown or grey in the summer to white in the winter; the Arctic fox is the only species in the dog family to do so. [87]
[16] [17] The relative lightness of female compared to male skin in a given population may be due to the greater need for women to produce more vitamin D during lactation. [18] The sweat glands in humans could have evolved to spread from the hands and feet as the body hair changed, or the hair change could have occurred to facilitate sweating.
In the words of camouflage researchers Innes Cuthill and A. Székely, the English zoologist and camouflage expert Hugh Cott's 1940 book Adaptive Coloration in Animals provided "persuasive arguments for the survival value of coloration, and for adaptation in general, at a time when natural selection was far from universally accepted within ...
This free downloadable lesson plan explores various species of animals that camouflage and dives deeper. Camouflage is an exciting animal adaptation that allows many different types of animals to ...
Freikörperkultur ('free body culture') represented a return to nature and the elimination of shame. In the 1960s naturism moved from being a small subculture to part of a general rejection of restrictions on the body. Women reasserted the right to uncover their breasts in public, which had been the norm until the 17th century.
Depictions of the human body, some of which explicitly nude, may be found in books in the context of human biology, [104] growth and development (especially during puberty), [105] [106] [107] human sexuality, [108] and sex education, [109] as appropriate for the age of the intended students.
Human history is the record of humankind from prehistory to the present. Modern humans evolved in Africa around 300,000 years ago and initially lived as hunter-gatherers.They migrated out of Africa during the Last Ice Age and had spread across Earth's continental land except Antarctica by the end of the Ice Age 12,000 years ago.
Active camouflage may now develop using organic light-emitting diodes and other technologies which allow for images to be projected onto irregularly shaped surfaces. Using visual data from a camera, an object could perhaps be camouflaged well enough to avoid detection by the human eye and optical sensors when stationary.