Answer each interface 1-5 by true, probably true, insufficient data, probably false, or false

In ecological biology, a keystone species is a species of organism that exerts a disproportionately large effect on its environment, relative to its size and abundance. The term 'keystone species' was coined in 1969 by zoologist Robert Paine in order to explain the relationship between a species of starfish and its local environment. The class example of a keystone species is the Sea Otter. Sea otters feed on sea urchins and other grazers of kelp, keeping their numbers in check and preventing them from damaging underwater kelp forests. North Pacific areas which are devoid of sea otters are often urchin barrens, areas with large number of sea urchins but little to no kelp. The sea otter therefore, protects kelp forests from over grazing by sea urchins, maintaining the ecological balance of their local environment. Inference 1: Sea urchins are a keystone species. Inference 2: North Pacific urchin barrens occur when sea otters abandon the area. Inference 3: Kelp forests are vulnerable to grazing sea urchins. Inference 4: Over hunting of sea otters leads to the damaging of kelp forests. Inference 5: The sea otter was the first stated example of a keystone species. True Probably True Insufficient Data Probably False Finish attempt ... False