Your answer is going to be A. Excretory.
If all nations agreed to reduce global warming then It would be good because the seals need icy conditions. So the less global warming then the more icy habitats there will be and the seals will have more places to live.
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C. A vertebrate because a vertebrate animal has a backbone. :)
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The building block of the cell wall is glucose ♥
Answer:
Supports a larger number of plant species and, therefore, a greater variety of crops. Protect freshwater resources. Promote soils formation and protection. Provide for nutrient storage and recycling.
Explanation: