The field of biology is a diverse one that includes the study of organisms from the small and simple to the large and complex. From biological molecules to biomes, the one theme that remains consistent is evolution. All species of living organisms are descended from a common ancestor. Although it may seem that living things today stay much the same, this is not the case. Evolution is actually an ongoing process. Additionally, new species are discovered regularly. For example, scientists have used a method called fluorescent in situ hybridization, which uses fluorescent probes to locate specific genes on chromosomes, to discover a green sea slug that can perform photosynthesis just like a plant. The slug obtains genes related to photosynthesis from the algae it eats through a process called horizontal gene transfer. In this process, genes can be transferred directly from one cell to another. The algal genes code for products that repair and maintain chloroplasts eaten by the slug. You can read more about it at this website.
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