You are presented with the question "How is survival ensured around hydrothermal vents?" and the following answer choices: 
- heat produced
 - Eating a lot
 - Reproducing quickly
 - biological diversity
 - vegetation
 - Being in a cluster
 - Staying far apart
 - hydrate their cells

Now knowing that organisms cluster around hydrothermal vents in the ocean floor and to survive, some organisms living near hydrothermal vents have formed close associations, choose the best answer.


 

      Being in a cluster   