one of the smallest units of biological classification; species may be defined based on a variety of evidence including anatomy, genetics, and behavior.
Life is complex and diverse but comes down to four little letters. The central code that makes all life on earth possible is found in a tiny molecule known as DNA.
Have you ever wondered how your cat, dog, bird, lizard, or fish is related to you? Animal bodies today are like living history books. They tell us a story that goes back at least 500 million years.
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