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.
Best Answer: The six kingdom system of life includes plants, animals, archaebacteria, eubacteria, fungi, and protists. The five kingdom system makes room for only animals, plants, fungi, protists, and then the two-lump monera kingdom (archaebacteria + eubacteria). The six-kingdom system is what we learn in the United States, most everyone else learns the five-kingdom system. The links below explain the tiny details that you're asking about.