- Domeniu: Education
- Number of terms: 4017
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一组具有一个有机体的正文中特定函数的单元格。肺组织、 血管组织和肌肉组织的各类组织在某些动物身上找到。组织通常由组成，几乎相同的单元格，并常常被组织成更大的单位，称为器官。
Industry:Biology
An animal with four limbs that evolved from a common fish ancestor during the Devonian Period (~365 million years ago). Tetrapods include amphibians, reptiles, birds, and mammals. Though "tetrapod" literally translates to "four-footed," many animals in this group have limbs adapted for different modes of transportation. Humans walk upright on two legs; the legs of whales, dolphins, and other marine mammals have evolved into fins and flippers; and snakes have lost their legs all together. Tetrapods are generally thought of as terrestrial animals, but some, like dolphins and whales, have returned to marine habitats.
Industry:Biology
