3) A sample of bacteria has been replicating itself over the last two years. The rate of replicating is 150% every 2 weeks. lfthe sample contained 10 cells of bacteria to begin with, how many bacteria cells will the sample contain after the two years? (3 marks) 4) Many elements on our earth and in the atmosphere have a half-life, meaning they are slowly dying off. Carbon 14, an isotope used in radiocarbon dating, is 5,730 years. This means that half a sample will decay over that time period. A fossil sample in a lab is estimated to be 80,000 years old and originally contained 7,115,020u parts of carbon 14. A test has indicated that 300u parts of carbon 14 remain. Is the fossil sample actually greater or less than the estimated age? (4 marks)