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  • There are no corals here and few fish! This used to be full of corals and there were fish of every color. Why did this happen?
  • Well, that sounds like a good topic to investigate. Coral bleaching is causing corals to die off. Coral bleaching is caused by many human activities. What human activities cause coral reef bleaching? 
  • We should start this investigation with determining the independent and dependent variables.
  • We now have to find out what the dependent and independent variables are. 
  • Yes, you are correct. The dependent variable are the coral reefs. The independent variable are the human actions. 
  • The independent variable are the human actions and the dependent variable are the coral reefs.
  • Investigations show that overfishing, pollution, and coastal development are causing coral reef damage.
  • We are now going to investigate how these reasons affect coral reefs. We are going to start by collecting and interpreting data. 
  • Information shows that, overfishing is affecting corals ecological balance and studies show that a one cruise ship destroyed 3150 km of corals anchoring. Pollution is another factor to coral reef damage. All of the litter thrown in water take many years to decompose. Plastic bags take 50 years to breakdown and plastic bottles 150 years. All of this litter is making the environment unhealthy because it contaminates the ocean. 
  • I have also found some information on how coastal development affects coral reefs. This makes the space limited and the land for the ocean is occupied with houses or ports. The construction of channels destroyed habitats and limited the flow of fresh water. It also fills the corals with sediment which produces little light penetration which can cause disruption to plants.
  • All of this information shows that, during the 1980s an important algae grazer, diadema, was reduced and regular algae increased which caused coral disease. 95% of diadema was reduced. From 1997-98 coral bleaching was elevated and diadema was still reducing. Also, studies show that 60% of the world's reefs are threatened by increasing human activity. 
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