Respuesta :
Answer:
The answer to your question would be that the group of words that is an adjective clause in the sentence is the following one: Where winters are long and cold.
Explanation:
It is a nonessential adjective clause, which is also called relative clause. This means that the information it provides is not relevant to identify the noun it modifies or to complete the meaning of the sentence. Consequently, it could be dropped without altering the meaning of the sentence (see 1). That is why it is offset with commas from the main sentence.
1) The Arctic region is home to more than 400 species of flowering plants