Arthropods. im not sure if that helps but, thats what they are called.
English metric systems are "feet, ounces, inches, etc..." and metric system is "centiMETER, METER, miliMETER"
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Answer to question 1;
In biology, evolution is the change in the characteristics of a species over several generations and relies on the process of natural selection. The theory of evolution is based on the idea that all species are related and gradually change over time.
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