Muscle and nerve tissues enable animals to move. The more advanced the muscular and nervous systems, the more complex the movements.
Evolution is a change in the body structure of living things that takes place slowly over a very long time. Evolution comes from the Latin word Evolvo which means stretching. Evolution in the study of biology means changes in the inherited characteristics of a population of organisms from one generation to the next.
Animals themselves experience the lowest level of development and form like creatures, ranging from viruses, bacteria, protozoa, worms, and fish to mammals. Evolution is still ongoing. Even faster process than in ancient times. Evolution as a gradual and gradual change is divided into several types, namely geological evolution, astronomical evolution, biological evolution, and cultural evolution.
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