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Many animals sleep a lot when young, but sleep much less when they get older, just________is the cas...

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a sleep to avoid eating  a temperature in a cold weather  a sleep in the cold season  an animal to practice sleep in winter  
They see if the animals respond to light and sound  They do this by observing changes in the animals’ brain signals, breathing, heartbeat, and muscle activity  They see if the animals’ eyes are closed  They can tell this by seeing if the animals lie down or not  
They see if the animals respond to light and sound.  They do this by observing changes in the animals’ brain signals, breathing, heartbeat, and muscle activity.  They see if the animals’ eyes are closed.  They can tell this by seeing if the animals lie down or not.  
many animals die during hibernation  hibernation protects animals during the wintertime  scientists feel puzzled about hibernation  some bats hibernate and others do not  
need to have a good sleep after they have exhausted themselves by getting rid of hunting animals  need to have a good sleep after they get tired from hunting other animals  are all mammals  almost always have a safe resting place  
need to have a good sleep after they have exhausted themselves by getting rid of hunting animals  need to have a good sleep after they get tired from hunting other animals  are all mammals  almost always have a safe resting place  
such as turtles and snakes cannot close their eyes  cannot be studied with an EEC  do not sleep in the true sense of the word  do not need to rest  
spend some time resting  close their eyes when sleeping  are good sleepers  are poor sleepers  
many animals die during hibernation  hibernation protects animals during the wintertime  scientists feel puzzled about hibernation  some bats hibernate and others do not  
spend some time resting  close their eyes when sleeping  are good sleepers  are poor sleepers  
The fat stored in their bodies.  Their thick fur.  Their warm burrows.  Their deep sleep.  
these animals rarely need any rest  they almost always keep alert to danger  they often stay awake  their eyes are rarely closed even when they are asleep  
a sleep to avoid eating  a temperature in a cold weather  a sleep in the cold season  an animal to practice sleep in winter  
a sleep to avoid eating  a temperature in a cold weather  a sleep in the cold season  an animal to practice sleep in winter  

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