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2. Why are there no land animals bigger than whales in the sea?
3. Why do small warm-blooded animals hibernate?
4. The main point of view of biometry is (in the original sentence):
5. "For example, the body of the Siberian tiger in China is more majestic than that of the South China tiger. The way to explain this sentence is: This sentence is meant to illustrate the sentence "". And these two sentences together are meant to illustrate the sentence "". Together, these illustrate the idea of "".
2. Because the weight of the animal increases in the square according to the length of the body, the longer the body, the greater the weight, the land animal lacks the buoyancy of water to support the weight, and the large body weight will press itself across, so the land animal is not larger than the sea whale.
3. The smaller the small animal, the larger the relative area, and the metabolism and heat dissipation are relatively fast, so it has to hibernate to maintain energy and heat.
4. The length of the animal is proportional to its area and body weight. As the animal grows, its area increases squarely by the length of the body, while its weight increases by the square of the length of the body.
5. For examples, it is generally ......Larger at lower latitudes. Conversely, larger animals are more able to withstand the cold of winter. The ratio of length, area and weight is still ......speed.
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The geometry we study today was founded by the ancient Greek mathematician Euclid (330-275 BC). His Primitives of Geometry, written in 300 B.C., has been regarded as the standard textbook for learning geometry for more than 2,000 years, so we call Euclid the father of geometry.
Euclid, born in Athens, received classical Greek mathematics and various scientific cultures, and became a famous scholar at the age of 30. At the invitation of the then king of Egypt, he lived in Alexandria, where he taught and researched.
The study of mathematics in ancient Greece has a very long history, and some geometric works have been published, but they are all about discussing a certain aspect of the problem, and the content is not systematic enough. Euclid brought together the achievements of his predecessors, adopted an unprecedented and unique way of compilation, first proposed definitions, axioms, and postulates, and then proved a series of theorems from simple to complex, discussed plane and three-dimensional figures, and also discussed integers, fractions, proportions, etc., and finally completed the monumental work "Geometry Originals". This book is the most successful textbook ever produced.
It replaced all previous textbooks as soon as it came out and has been in use for more than 2,000 years since. After it was printed in 1482, it was reprinted in about 1,000 editions and translated into all major languages of the world.
Euclid was a gentle educator. He is rigorous in his studies and good at persuasion. We oppose the style of opportunism and short-term success.
Once, the powerful king of Egypt asked the mathematician Euclid to teach him geometry. Euclid spoke for a long time, and the king was confused, and in desperation, he asked Euclid if there was any easy way to understand geometry. Demolition state Euclid:
In geometry, one can only take one road, and there is no avenue paved for the king. This sentence has become a learning proverb that has been recited through the ages.
Euclid was kind and tireless in his pupils; However, when students are shaken by their studies, he also lashes them with bitter sarcasm. Once, one of his students asked him what were the benefits of learning geometry? He humorously said to the servant:
Give him three coins because he wants to make a profit from his studies. ”
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