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| 2 | When an organism produces more offspring than can survive | 
 
 
| 3 | A young organism that develops from a zygote | 
 
 
| 6 | A difference between individuals of the same species | 
 
 
| 7 | A group of similar organisms that mate and produce fertile offspring | 
 
 
| 8 | A press by which individuals that are better adapted to environment are more likely to survive | 
 
 
| 9 | A trait that helps an organism survive and reproduce in its environment | 
 
 
| 10 | The gradual change in species over time | 
 
 
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