Why would losing just a few dozen aquatic species lead to the end of life in the ocean as we know it?
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It would unbalance the ecosystem.

Due to the fact that if some species die off, the other species that rely on those species for food or protection would loose that food/ protection which may lead to their extinction and their extinction would lead to another extinction and so on.

The ecologists then compare ecological characteristics among the plots, noting which plot includes plants in more or fewer of these Ecologists examine satellite imagery of South America. ... The ecologists, therefore, are able to map and quantify the extent of the various types of plant 1. Ecosystem diversity. 2