BIRDS MAKE UP THE CLASS AVES.There are more than 9,000 species , almost all of which can fly.(the only flightless birds are Penguins , ostriches, rheas,cassowaries, and kiwis ). The ability to fly is reflected in the typical bird features ; forelimbs modified as wings , a streamlined body ; and hallow bones to reduce weight. ALL birds lay hard-shell eggs , which the parents incubate.Birds beak and feet vary according to diet and way of life .Beak range from general p...
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SCIENTISTS have developed a tiny implant , no bigger than a pinhead , which sits inside&n bsp; the cor nea to reverse vision problems in aging eyes . With the age ,some people's ability to switch focus between near and distant objects diminishes , a condition known as presbyopia .It can skew the perception of depth and makes reading in poor light impossible . The new implant slightly increase the curvature of the cornea,which allows the eyes to focus again.This new technique ,known as a' Raindrop corn...
THERE ARE MANY KINDS OF DESERTS IN THE WORLD-Such as snow deserts, water deserts and sandy or dry deserts.In Sandy or dry desert there are vast tracts of sand with very high temperature and difference between day and night temperature..There are sand storms that blows hard and make life dangerous.Sand dunes are ever changing their shapes and places by the work of winds. Animals and plants adapt themselves to be able to survive in this harsh environment....