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Excess Nutrients in seawater

Increase in ocean temperature

Increase in ocean acidity

Sea level changes

Competitor species like plankton and algae grow large and crowd out coral

Loss of algal partners that are required to make food

Increased exposure to disease causing organisms

some of your causes might be acidic rain or natural wildfires that cause the parks to be degraded

hope this any more questions i am here plz mark brainliest

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)]