Mathematical geniuses in animals read answers.

15 when the snake crawls, take the sine function diagram; Ants have superb counting skills; Cormorants can count; Spider's "gossip" web is a complex and beautiful octagonal geometric pattern; Wild monkeys and chimpanzees have mathematical minds and can measure.

Sentence 16A: Example. The example of snakes shows that there are quite a few mathematical principles in the living habits of animals.

B: List the numbers. Specifically, the number and power distribution of ants are highly consistent with the proportion of grasshopper block size, which highlights the fast and accurate ant counting. (It is pointed out that the interpretation method is 1 and the interpretation function is 2).

17 cannot be deleted. "Even if" and "Ye" are used together to express a hypothetical relationship, making a virtual comparison between people drawing with tools and cobwebs, and highlighting the symmetry of cobwebs.

18 Example 1: Get close to animals and enjoy life. Example 2: There is only one earth for human beings, but there are not only human beings on the earth! (The answer is not unique)