a backbone, the line of bones down the centre of the back that provides support for the body, vertebrate, an animal that has a spine, fin, a thin vertical part sticking out of the body of especially a fish or an aircraft that helps balance and movement, amphibians, animals that live both on land and in water but must produce their eggs in water). Frogs, toads, and salamanders, mammal, any animal in which the female gives birth to babies, not eggs, and feeds them on milk from her own body, invertebrate, an animal with no spine, exoskeleton, a hard outer layer that covers, supports, and protects the body of an invertebrate animal, locusts, shedding, the natural or intentional process of getting rid of an outer covering, a substance, or an unwanted element, moulting, (of a bird or animal) to lose feathers, skin, or hair as a natural process at a particular time of year so that new feathers, skin, or hair can grow

science

由
打印
嵌入

排行榜

我们目前正在努力改进排行榜功能。请通过提供您的反馈来帮助我们。

提供反馈

视觉风格

选项

我们目前正在改进活动设置。请通过反馈帮助我们。

提供反馈

切换模板

恢复自动保存：？