Answer:
Your answer is D. Excess nutrient levels
Explanation:
Everything in Earth's<span> system can be placed into one of </span>four major<span> subsystems: land, water, living things, or air. These </span>four<span> subsystems are called "</span>spheres<span>." Specifically, they are the "lithosphere" (land), "hydrosphere" (water), "biosphere" (living things), and "atmosphere" (air).</span>
Oklahoma City is the answer
Answer:
d.Modena and Parma didnt become part of sardinia
