What important discovery did researchers aboard the alvin make?

The correct answer will be hydrothermal vents  and deep-sea ecosystems.

Explanation:

Alvin stands is a deep-Sea Submersible which stands for  "Air-Launched Vehicle Investigation". This submersible is named after the engineer Allyn Vine of Woods Hole Oceanographic Institution (WHOI) who operates this submersible.  

Alvin is owned by the American navy today which has helped in scientific discoveries especially hydrothermal vents  (380° C) called  'black smokers' in East Pacific Rise in an expedition in 1979. This also helped in the understanding of deep-sea ecosystems which exists in dark conditions without sunlight.

Thus, hydrothermal vents  and deep-sea ecosystems are the correct answers.

hi, natural selection of the peppered moth during the industrial revolution in 19th-century england is an example of an outlier in the study of evolution. during this time, pollution from factories filled the forests, coating trees in a layer of soot—turning white trees black

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