Compared to those without food, animals without sleep are more likely to suffer from .
Sleep is necessary for all animals, whether they are reptiles, or fish.
Differences in animals’ sleep and reasons for their ways of resting
Dolphins
Swim to the surface when sleeping, because they need to .
Birds
Are constantly in the presence of numerous predators.
Horses
Do most of their sleeping standing up.
Do occasionally take short naps lying down. Lying in one position for a long time could well injure a horse, because their are delicate.
Potential problems encountering
Animals can also have , the same as humans
Importance of sleep in humans
It helps us to organize our of the day
It plays a key role in
E.g.
Because of the similar sleeping pattern to that in humans, are studied in order to increase our knowledge of human physiology.
Scientists choose to study the of the fruit fly in order to know the function of the human gene and understand development processes in humans.
GIẢI THÍCH CÂU 1
Mình cần nghe xem nếu thiếu ngủ, động vật có khuynh hướng bị gì (likely to suffer from ____)
Tác giả đã nhấn mạnh “Without sleep, an animal is much less capable of avoiding an attack”
=> Động vật sẽ dễ bị tấn công hơn khi thiếu ngủ
=> Likely to suffer from attack
=> Đáp án: attack 
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