A biological community of interacting organisms and their physical environment.
Answer:
The blank is "apart."
Explanation:
Mid-ocean ridges are geologically important because they occur along the kind of plate boundary where a new ocean floor is created as the plates spread apart. Thus the mid-ocean ridge is also known as a "spreading center" or a "divergent plate boundary." The plates spread apart at rates of 1 cm to 20 cm per year.
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Explanation:
1. they are convenient to use 2. it helps the international tade 3. it eases the exchange of material
