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a special feature that helps an animal survive 开始学习
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the way air moves around something, often affecting how it moves 开始学习
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the coldest place on Earth, at the very bottom of the world 开始学习
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a small fox that lives in very cold places near the North Pole 开始学习
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a strong snowstorm with lots of wind 开始学习
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how warm the inside of a body is 开始学习
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colors or patterns that help an animal hide 开始学习
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the things carried inside a vehicle (e.g., gifts or toys in a sled) 开始学习
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animals whose body changes temperature with the air or water 开始学习
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the rules or limits that tell you what you can and cannot do 开始学习
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a hole or tunnel where an animal lives or hides 开始学习
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to plan and make something for a specific purpose 开始学习
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how far something moves from the start to the end 开始学习
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closed on all sides or covered completely 开始学习
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strength needed to move, grow, and stay alive 开始学习
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everything around an animal, like land, air, and weather 开始学习
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a person who travels to new or hard-to-reach places 开始学习
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very, very cold (0°C or below) 开始学习
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the force that slows things down when they rub together 开始学习
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animal hair that helps them stay warm 开始学习
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a big, slow-moving river of ice 开始学习
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the natural home where animals or plants live 开始学习
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a long winter sleep (the Arctic fox does NOT do this) 开始学习
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to stay close together to keep warm 开始学习
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a huge layer of ice covering land 开始学习
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a large piece of ice floating in the ocean 开始学习
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something that keeps heat inside and cold outside 开始学习
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not correct or acceptable because a rule was broken 开始学习
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开始学习
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a group of babies born at the same time 开始学习
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the things used to build or make something (e.g., cardboard, tape) 开始学习
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to find out how long, wide, or heavy something is 开始学习
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to turn from ice into water 开始学习
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to move to another place when seasons change 开始学习
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an animal that eats both plants and meat 开始学习
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an animal that hunts other animals for food 开始学习
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an animal that is hunted by another animal 开始学习
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to keep something safe from danger or harm 开始学习
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learning more by studying something carefully 开始学习
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to eat food left by other animals 开始学习
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a person who studies how things work in nature 开始学习
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to fasten or hold something so it doesn't move or fall 开始学习
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the ability to smell things 开始学习
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a surface that goes up or down at an angle 开始学习
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a tiny piece of snow, soft and unique 开始学习
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the top layer of something (e.g., the floor or the ramp) 开始学习
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staying alive in a hard or dangerous place 开始学习
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how hot or cold something is 开始学习
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not thin; something wide from one side to the other 开始学习
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a lot of soft hair that keeps an animal warm 开始学习
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one attempt at doing something to test how well it works 开始学习
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a cold, frozen land with no trees 开始学习
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something that can change and affect the results of an experiment 开始学习
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a place where people study and measure weather 开始学习
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