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Animals are composed of eukaryotic cells without cell walls, differentiating them f Most animals reproduce sexually, involving the combination of genetic material from two ...

Fish are a diverse group of aquatic animals that are characterized by gills, fins, and a streamlined body. They belong ...

...species. Although less common than maternal care, the involvement of male animals in raising offspring is a fascinating subject with significant ecological a ...

There is broad scientific consensus that many animals are sentient, particularly [[Vertebrate|vertebrates]] (mammals, birds, fish ...

...noamine]] [[neurotransmitter]] found in the [[brain]] and [[body]] of many animals, including humans. It is a [[catecholamine]] and [[phenethylamine]]. Dopami ...