1.
A struggle or competition between two or more sides
2.
A place where animals occur naturally, opposite of zoo
4.
A place where a certain species naturally occurs
7.
To acquire new skills or knowledge
8.
The way in which an organism acts or behaves
9.
A way or means of approaching or obtaining things
10.
A requirement for something that must be met
12.
To keep away from something
13.
Any specific element, compound or alloy
15.
Emotional state; opinion
16.
To use nose to obtain a scent or smell
17.
To obtain food by tracking and killing prey
18.
To treat someone or something poorly
19.
A connection between two or more people or things
20.
The act of meeting conditions necessary to continue living
