pmn04 pmn04 18-05-2022 Biology contestada URGANT HELP!!! Need help with crossword only have three left #7 clue: This occurs over polar regions at certain times of the year. (2 words) #11 clue: This type of forest is a nonrenewable resource. (3 words) #21 clue: This refers to the number of different species in the biosphere. (2 words) *Will give Brainliest*