Identify a physical, chemical, or biological feature of hydrothermal vents, and explain why this feature makes hydrothermal vents a unique ocean
system.

d. new methods of assembly are introduced.

explanation:

this allows for the goods to be made on a larger scale. not faster because now it is shown to be made better, hence the greater productivity in the question. it is calling for something new to be introduced.

where are the statements without that i cant you