Science crossword

what is a region that is devoid or almost devoid of vegetation esp because of low rain fall
What is a large community of plants and animals that occupies a distinct region
What refers to the top layer of a habitat zone
What is a cold treeless usually lowland of far northern regions
What is a semi enclosed coastal body of water
What is The movement or transport of seeds away from the parent plant
What is a tropical woodland with an annual rain fall of at least 100 inches
What word defines ten pasture air pressure humidity precipitation sunshine cloudiness and winds
A natural elevation of the earths surface rising more or less abruptly to a summit
What is a grassland region with scattered trees
What is it called when an organism becomes better fitted to survive and multiply in its environment
What is an under layer of vegetation
What a thick layer of soul that remains frozen throughout the year called
What is a zone of the ocean where sunlight reaches the ocean floor
What is the clearing of trees and turning forests into clear land called