Which of the following statements about the tundra is true? a. the tundra has a dense covering of trees. b. there are two main categories of the tundra biome. c. temperatures in the tundra range from extreme highs to extreme lows. d. the tundra biome does not support animal life.

The correct answer is b. There are two main categories of the tundra biome.

Tundra forms one of the coldest biomes of the Earth. There are two main categories of tundra: arctic tundra and alpine tundra. They are treeless regions with cold and windy climate. Rainfall is very less. For the maximum time of the year tundra lands are kept covered with heavy snow. In summers, wildflowers grow in tundra ecosystem.Animals found in the alpine tundra are mountain sheep, goats, birds, and marmots which feed on plants and insects found in lower regions. Plants in these areas grow in rock depressions which provide them shelter from winds as well as warm temperature.The average temperature of arctic tundra is -12 to -6 °C where animal species like polar bears, arctic foxes, gray wolves, snow geese etc are found.

The answer should be b. There are two main categories of the tundra biome (arctic and alpine). 

Hope this helps my guy.

The answer is a because - is an direction