What is limiting an increase in Old Growth Forest in Canada?

Northeastern china, north korea, northern japan containing coniferous forests, temperate grasslands, and agriculture, are all part of what climate zone? a. tropical desertb. desertc. humid subtropicald. humid continental

These factors threaten north americas ecosystems

According to the earth science reference tables, during which geologic time period were the continents of north america,south america, and africa closest together?