
Who were the first animals on Earth? What differentiates a reptile from an amphibian? How do mammals give birth? What are bird wings made of? This boxset of six encyclopedias will answer these and more hows and whats for you. Learning is made simpler with well-labelled diagrams...

Earth, the third planet from the sun, is the only one teeming with life. It is wondrous, mysterious with a life of its own. This boxset of 6 encyclopedias will answer all your questions about our magnificent Planet Earth-- about the various formations on earth, its vast forests,...