Limestone is a sedimentary rock that is composed primarily of calcite. It forms from both the chemical precipitation of calcium carbonate and the transformation of shell, coral, fecal and algal debris into calcite during diagenesis.
To calcu-late the PPF, suppose that Crusoe puts all 8 hours into gathering fruit, so that he gets 36 pounds. But there is no time left for fishing, so he gets 0 pounds of fish. If he takes an hour off from gathering fruit, he gets 35 pounds of fruit and has an hour in which to fishâso he gets 4 pounds of fish.The rest of the PPF is con-structed similarly. 2.ut there is no time left for fishing, so he gets 0 pounds of fish. If he takes an hour off from gathering fruit, he gets 35 pounds of fruit and has an hour in which to fishâso he gets 4 pounds of fish. The rest of the PPF is con-structed similarly. 2.
Quick Answer. In the 17th century, the English physicist Robert Hooke discovered plant cells while examining cork under a microscope. He was the first to refer to the units as cells because their boxy appearance reminded him of monastery cells. Robert Hooke, the Curator of Experiments for the Royal Society, performed extensive work with microscopes. He is also famous for discovering the law of elasticity, known as Hooke's Law, and for his book Micrographia in which he details his observations while using the microscope.