6. The professor explains how animals cope with the cold temperature in winter by giving two examples.
First, he describes super cooling by which animal's bodily fluid cools down without forming a ice crystal. (Hard to get the meaning) The arctic ground squirrel is a good example of this. The squirrel endured freezing temperature during hibernation by using the super cooling. The requirement for this animal to do super cooling is that the squirrel need to stay still. (Awkward sentence)
Second, he describes the thickening of the fur. This reaction occurs in almost every mammals that remains active during winter. The deer is a good example of this. When winter comes, the deer makes its fur more thicker and denser. The renewed fur serves as a insulating barrier between the deer and harsh weather.
These two examples illustrate how animals deal with cold climate.
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