现在已被人们认识的生物有多少万种

2025-03-15 10:48:29
推荐回答(1个)
回答1:

地球上的生物估计250万到3000万种,目前已知的大约只有200万种。其中3/4以上种类属动物界。
现已命名动物150万种以上,而且每年还在增加数千种。其中,原生动物现知有60000种;海绵动物又称多孔动物,大约有10000多种;腔肠动物约有10000种;扁形动物有15000种;线形动物有80000种以上;环节动物约有17000种;软体动物有130000种以上;节肢动物是动物界种类最多,分布极广的一门动物。现知100多万种,约占动物种类的85%,估计有1000万种;棘皮动物现存约有6000余种;脊索动物现存约有70000余种,包括鱼类、两栖类、爬行类、鸟类和哺乳类。
现在知道自然界的植物约有30余万种。其中,藻类植物约有2.5万余种;菌类植物约有90000余种;地衣植物有25000余种;苔藓植物约有2.3万种;蕨类植物约有1.2万多种;裸子植物现存近800种;被子植物是植物界中发展到最高等的类型,约有20万种以上。此外,还有真菌12万种以上。

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