1、2壺帴棩Human population nearly a equator have a vod dark skin over many generations because of the exposure to the fierest rays of the sun. A similar phononmenon has also occurs another part of the animal kingdom. The african grass mouse is a pretty example. Most mice are nocturnal, but the african gra
2、ss mouse is active during daily light hours. This means that dkaj day searching for food in the sundrive bush and scrubby habitet of eastern south africa, its frest stripe like a chipmunk which helps them blend in with the fdkaj. Because they spend a lot of time in the intend traffical sun, the gras
3、s mouse has also aviod two safri face gurad to anti the suns otribel radiation, first like the population of human that nears the . the world, the skin of the grass mouse can tain the lots of the melanin or dark pigment, second and quite on usual this mouse have a late of melanin and pigment taketia
4、l between its skull and skin, this unique cap provide extre measure of protection for the grass mouse, and .other type of the african grass mouse like. that active during the day. The only other species scientist have identified was the seem sort ., is the quite time making bat of the central americ
5、an .All though these bats sleep during the day. They do so croud up with their heads expose to the sun. 壺帴棩Human populations near the equator have evolved dark skin over many generations because of exposure to the fiercest rays of the sun. A similar phenomenon has also occurred in other parts of the
6、 animal kingdom. The African grass mouse is a good example. Most mice are nocturnal, but the African grass mouse is active during daylight hours. This means that it spends its days searching for food in the semi-dry bush in scrubby habitats of eastern and southern Africa. Its furry stripes like a ch
7、ipmunks, which helps it blend in with its environment. Because it spends a lot of time in the intense tropical sun, the grass mouse has also evolved two separate safeguards against the suns ultraviolet radiation. First, like the population of humans in this region of the world, the skin of the grass
8、 mouse contains lots of melanin, or dark pigment. Second and quite unusual, this mouse has a layer of melanin-pigmented tissue between its skull and skin. This unique cap provides an extra measure of protection for the grass mouse and three other types of African mouse, like rodents that are active
9、during the day. The only other species scientists has identified with the same sort of skull adaptation is the white tent-making bat of the Central American tropics. Although these bats sleep during the day, they do so curled up with their heads exposed to the sun. 1.equator: n. 2.nocturnal: adj. 3.scrubby: adj. 4.stripe: n. 5.chipmunk: n. 6.ultraviolet: adj. 7.melanin: n. 8.pigment: n. 9.rodent: n. 10.skull: n.