Conditions that challenge marine ecosystems in the Arctic include

you find the most productivity in the Arctic

The Antarctic seas are some of the most productive marine ecosystems because

The northern limit of the Antarctic seas is called ___________. It is at approximately __________

There is not primary productivity in most of the deep ocean because

Most of the deep ocean gets its nutrient from

Organisms found in the abyssal zone are primarily

A whale fall is

Whale fall ecosystems go through 3 stages. The second stage is

Scientists know little about ecosystems existing in the hadal zone because there is nothing of interest to study there

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