ecology Crossword

the branch of biology that deals with the relations of organisms to one another and to their physical surroundings.
the regions of the surface, atmosphere, and hydrosphere of the earth (or analogous parts of other planets) occupied by living organisms
of, relating to, or resulting from living things, especially in their ecological relations
A factor present in an environment that controls a process, particularly the growth, abundance or distribution of a population of organisms in an ecosystem.
the proportional increase
all the inhabitants of a particular town, area, or country
a group of interdependent organisms of different species growing or living together in a specified habitat:
the sometimes swampy coniferous forest of high northern latitudes, especially that between the tundra and steppes of Siberia and North America.
a vast, flat, treeless Arctic region of Europe, Asia, and North America in which the subsoil is permanently frozen
a grassy plain in tropical and subtropical regions, with few trees.
nonliving things in an ecosystem
a source of alternative energy