We can't use both. The answer is to use the one with the smaller absolute value: With this definition of. A slightly different formal definition of the limit is used when x goes to +/- infinity, since we really cannot subtract x from infinity or vice versa-remember, infinity is a concept, not a number. Formally, the expression. Means that.
During the long interval of the Precambrian Era (which includes approximately 90% of geologic time and includes three Eons: the Hadean, the Archean and the Proterozoic) the only inhabitants of the Earth were simple microscopic organisms, many of them comparable in size and complexity to modern-day bacteria.
When did this period take place? 17. Name five living things from this period. (your list can include plants, animals, or a combination of both) 18. Where have fossils from this period been found? (localities) Cenozoic Era. 19. Identify the time period covered by the Cenozoic. 20. Describe has happened during the Cenozoic in terms of. a. Continents b.