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Biology Crossword Review

Across
The regions of the surface, atmosphere, and hydrosphere of the earth occupied by living organisms
An education guess, if then statement
A scientific procedure undertaken to make a discovery and test a hypothesis
Group in the experiment or stay that does not receive treatment
An element that is liable to vary or change
A particular section of animals living in an area or country
The action or process of observing something or someone carefully in order to gain information
An organism that recycles the nutrients by decomposition as it feeds on dead or decaying organisms
Relationship between two things in which one of them benefits from or lives off of the other.
Down
A biological community of interacting organisms and their physical enviroment
Obtains its food and energy by taking in organic substances
A large naturally occurring community occupying a major habitat
The preying of one animal on others
Organisms that produce organic compounds for the entire ecosystem
Association between two organisms in which one benefits and the other derives benefit or harm
Organism that obtains food by feeding on other organisms because they can't create their own
Creates its own energy
Symbiosis that is beneficial to both organisms involved
A group of species living in the same place or having a particular characteristic in common
System of ideas intended to explain something, especially one based on general principles independent of the thing to be explained