Biology - is the study of living things., Classification - is when living things are grouped based on the features that the living things share., Biodiversity - is the rich variety of life on Earth., Ecosystem - is made up of all of the living and nonliving things in an area., Organism - is any living thing, from the smallest bacteria to the humongous blue whale., Characteristic - is the appearance that makes an individual or group different from others., Vertebrate - is an animal with a backbone., Invertebrate - are animals without a backbone or bony skeleton., Dichotomous keys - are used to show the different physical characteristics of an organism. Dichotomous means cutting in 2., Couplet - is the 2 step choice of a physical characteristic in a dichotomous key., Hierarchy - means that the characteristics earlier in the dichotomous key are shared by more organisms than the characteristics later in the key.,

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