The correct answer should be because they want to establish a sense of time passing by and things changing over the course of time. Each new era is influenced by the previous one so the way time passes is important because as time passes by things change and the historians monitor it and record it in a chronological order.
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The answer is
The digestive system excretes a solid waste and the excretory system excretes a liquid waste.
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During translation, a ribosome reads a sequence of mRNA (messenger RNA) in groups of 3 bases called codons. The ribosome then calls for a tRNA (transfer RNA) molecule with another group of 3 bases that correspond to the codon. This group of bases is called an anticodon. The ribosome strings the anticodons together to create an amino acid chain, and then final processing occurs to create the desired protein. In a way, the ribosome is translating the language the mRNA is using into a language that the tRNA can understand, hence why translation is used.
Yes because <span>A </span>habitable zone<span> (HZ) in astronomy is a region of space where conditions are best for life to form as on Earth. Planets in these areas are the most likely to have extraterrestrial life. The </span>habitable zone<span> may also be called the "life zone", "comfort zone", "green belt" or "Goldilocks zone".</span>
All protozoans are unicellular (are a single cell). Similar to the plant-like protists, protozoa are found in nearly all aquatic habitats. Protozoa play a key role in maintaining the balance of ecosystems. They are an important food source for organisms higher up in food chains.