Title | Zebras have their own bug repellent? | |
Reasons for zebras developing their strips | Original belief | With the black and white lines, one zebra is difficult to single out while traveling with a herd, thus ___小題1:___ it from its enemies. |
New theory | Zebras, residing in Africa where there are most horseflies in the world ,have developed strips to avoid being___小題2:____ . | |
A study | Researchers | A team of scientists from ___小題3:____ |
____小題4:____ | To test if strips are developed to make zebras less attractive to flies. | |
Clues | *White or light-colored horses are less __小題5:___ to get bitten than dark ones. *Zebras develop strips as they grow older though born black . | |
Method | *Some boards at a horse farm are painted with patterns of black and white stripes variously ___小題6:___ , a layer of glue applied on them *Measured the polarized light reflected from real zebra skins | |
_____小題7:___ | *The places where the black and white stripes were similar to the ___小題8:___zebras have attracted the fewest flies *Strips of zebras matched light patterns that were the least attractive to horseflies | |
Principle of zebras’ black and white strips repelling the flies | Horizontally polarized light, which white does not reflect, ____小題9:___ to horseflies. | |
Conclusion | ____小題10:___tested on real zebras, the theory isn’t definitely true. |
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