🗂️ 生物分类：界门纲目科属种🗂️ Biological Classification: Kingdom to Species
上一片里，森林里的住户各占一角。可要说起它们，先得有名字：这只叫狼，那株叫向日葵。这一片看人类怎么给几百万种生物排座次——生物分类。Last leaf, every forest resident held its own corner. But to talk about them we need names: this one is a wolf, that one a sunflower. This leaf shows how humans file millions of species into order — biological classification.
第 1 步：七级台阶Step 1: Seven steps
先看整理生物的七级台阶。Meet the seven steps used to file living things.
分类学家把“像不像”变成七级台阶：界、门、纲、目、科、属、种，从上到下，越往下越像。以狼为例：动物界 → 脊索动物门 → 哺乳纲 → 食肉目 → 犬科 → 犬属 → 狼。每一级都是一个大箱子，箱子套箱子，最里面只放着一种生物。Taxonomists turn “how alike” into seven ranks: Kingdom, Phylum, Class, Order, Family, Genus, Species — the lower you go, the more alike the members. Take the wolf: Animalia → Chordata → Mammalia → Carnivora → Canidae → Canis → wolf. Each rank is a box inside a bigger box, and the innermost box holds just one species.
那“像不像”到底看什么？So what counts as “alike”?
第 2 步：长得像，就往一堆里放Step 2: Sort by similarity
猫、虎、狼都是吃肉的猛兽，同属食肉目。但猫和虎更亲：圆脸、能缩爪、爱独行——同属猫科；狼群居、长鼻、能长途奔跑——归入犬科。分类不只看长相，还看骨骼、行为，甚至 DNA：把亲缘最近的放进同一堆。Cats, tigers and wolves are all meat-eaters, all in the order Carnivora. But cat and tiger are closer kin: round faces, retractable claws, solitary — family Felidae; the wolf lives in packs, has a long snout and runs long distances — family Canidae. Classification uses not just looks but bones, behaviour and even DNA: nearest relatives go in the same pile.
堆分好了，怎么让全世界都叫对名字？The piles are ready — now how does the whole world use the same name?
第 3 步：每种生物一张学名名片Step 3: One name card per species
狮子在各国的叫法都不同，但学名只有一个：Panthera leo——属名 Panthera + 种名 leo，用斜体书写，这就是林奈的双名法。属名像“姓”，种名像“名”；Panthera 这一属里还有虎（Panthera tigris）和豹（Panthera pardus）。往上还有更大的分法：三域（细菌、古菌、真核）、五界（原核、原生生物、真菌、植物、动物）。A lion has many names in many languages, but only one scientific name: Panthera leo — genus Panthera + species leo, written in italics; this is Linnaeus's two-part naming system. The genus works like a surname, the species like a given name; the genus Panthera also holds the tiger (Panthera tigris) and the leopard (Panthera pardus). Above it sit even bigger groupings: three domains (Bacteria, Archaea, Eukarya) and five kingdoms (Monera, Protista, Fungi, Plantae, Animalia).
🎮 你来当分类整理师（30 秒）🎮 Your turn: become the sorting officer (30 seconds)
4 张生物卡等着归档：狼、蜜蜂、向日葵、双孢蘑菇。从界到种，一级级选对，卡片就归位了。Four creature cards await filing: wolf, honeybee, sunflower, button mushroom. Pick the right option at each rank, Kingdom down to Species, and each card lands in its place.
一句话记住它：生物分类用“界门纲目科属种”七级台阶给生命排座次；每种生物只有一个学名 = 属名 + 种名。Remember it in one line: classification seats every living thing on a seven-step ladder, Kingdom to Species; and each species carries one scientific name = genus + species.
七级：界门纲目科属种，越往下越像Seven ranks, from Kingdom down to Species看相似性归堆：猫虎同科，狼另立一科Sort by similarity: cats and tigers share a family, wolves another学名 = 属名 + 种名，斜体，如 Panthera leoScientific name = genus + species, in italics, e.g. Panthera leo往上还有三域、五界的大分法Above that: three domains, five kingdoms
内容参考 OpenStax 等公开教材，多来源核对 · AI 生成、人工审核 · 发现错误欢迎指正，帮这片叶子长得更好。Based on OpenStax and other open textbooks, cross-checked across sources · AI-generated, human-reviewed · Spotted a mistake? Tell us — help this leaf grow.
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