How eutrophication can change an aquatic ecosystem into a land ecosystem

Eutrophication is the enrichment of an ecosystem with chemical nutrients, typically compounds containing nitrogen, phosphorus, or both.

Eutrophication can be a natural process in lakes, occurring as they age through geological time.

Eutrophication was recognized as a pollution problem in European and North American lakes and reservoirs in the mid-20th century.

Human activities can accelerate the rate at which nutrients enter ecosystems.

answer : haversian

[explanation: -(compact bone is organized as parallel columns, known as haversian systems, which run lengthwise down the axis of long bones. these columns are composed of lamellae, concentric rings of bone, surrounding a central channel, or haversian canal, that contains the nerves, blood vessels, and lymphatic system of the bone)]