1. Cattle have four stomachs: rumen, valve, reticulum and wrinkled stomach, each with its own function to break down plants. Ruminants have evolved rumination skills to make food easier to digest. The wrinkled stomach is the only stomach that contains gastric acid, and the rest of the stomach is suitable for microbial growth and decomposition plants.
2. The main reason for the restriction of carrying water on the aircraft is safety considerations: the liquid may be misjudged as dangerous goods, increase the weight and consume fuel, and the high air pressure is easy to deform the water bottle and leak and pollute the cabin.
3. Dark clouds are formed by the condensation of fog droplets, which appear dark due to the large water content. There are various forms such as layered, accumulated, and wavy, thick clouds are difficult to transmit light and appear black, and thin clouds are gray, which is a natural phenomenon.
4. Leaves go through a natural cycle of growth, aging, and death, and produce nutrients and release oxygen through photosynthesis, which is essential for the survival of humans and animals, and the length of life varies.
5. Gorilla chest-beating behavior has the functions of social communication, deterrence and advantage display, territorial declaration, and emotional expression, reflecting its strength and emotional state, and strengthening its community status.
6. The word "road" is derived from the ancient road used by horses and carriages, or is related to the road construction method of the British engineer John Macadan, and it is also said to be related to the trading activities of the Shang Dynasty.
7. Glass is an amorphous material with disordered atomic arrangement and isotropic physical properties. Due to its slow cooling rate, the mixture remains amorphous during manufacturing. Amorphous has no fixed melting point, and the arrangement of atoms is not as regular as crystalline.
8. Gold is yellow because its physical properties make it easier to absorb light at certain frequencies, rather than reflecting a silvery-white luster like other metals.
9. Travelers refer to enthusiasts who love outdoor sports and self-help travel, which originates from the Internet, and evolves from the homonym of "tourism" and "green friends", emphasizing independent self-help and environmental awareness. Travelers refer to people, not tourism itself.
10. Most of the hotel bed sheets are white, because they are versatile, give people a sense of cleanliness and relaxation, and are convenient for cleaning staff to check and clean to ensure hygiene. Although white is easy to get dirty, the hotel pays attention to cleanliness, and changes the bed sheets every time you change rooms to keep them tidy.
11. Studies have found that children from about 7 years old are prone to childhood amnesia, and the memory retention rate decreases with age. This may be related to the rapid growth of neurons in the brain during infancy that disrupts the functioning of the hippocampus.
12. The head of the sheep stems from its gregariousness, territorial marking, and expression of emotion. This is both a social act and can inadvertently hurt people, but it is not intended to be into.
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