每个生物体的生命周期都极其独特。
Every organism has a life span which is highly characteristic.
这里的牛因此成为了关于早春是如何影响生物气候学(季节性的生命周期事件)，的绝好的资源。
The cattle are thus an excellent source of long-term info on how earlier springs affect what's called phenology-seasonal lifecycle events.
这种微生物已经进化一种有关老鼠脑髓的非同寻常生命周期。
Thus the organism has evolved an unusual lifecycle relating to the brains of rats and mice.
就算是最长寿的动物，其生命周期对于癌症而言也太过短暂，让它来不及演化出跳转到另一种生物身上的能力。
The life spans of even the longest-lived animals may be just too brief for cancers to easily evolve the ability to leap to another body.
但生物学家表示，能最好反驳生命周期不可改变这种观念的证据一直都显而易见：生物衰老的速度可以是天差地别的。
But the best argument that life span is not hard-wired, biologists say, has long been evident: Living things age at significantly different rates.
褪黑素(MT)由松果腺分泌，具有明显的生物节律性，包括昼夜节律、季节节律和生命周期节律。
Melatonin (MT) is secreted by the pineal gland and has obvious biological rhythmicity including circadian, season rhythm and life rhythm (aging clock).
所有生物都有有限的生命周期所以繁殖后代非常重要。探究繁殖系统基本要素包括的各个生理器官(植物的和动物的)以及基因遗传。
All organisms have a finite life-span thus the need to procreate is Paramount. Explore the fundamental aspects of reproduction including physical organ (in plants and animals) and genetic inheritance.
细胞程序性死亡是多细胞有机体生命周期中正常的组成部分，细胞程序性死亡过程的存在对生物体是一种保护机制。
Programmed cell death (PCD) is a cell death process that is a normal part of the life cycle of a multicellular organism.
人类和动物生命周期都从受精卵开始 然后一步一步地发育成具有多元组织和器官的生物体 。
Life cycle of human and animals starts from single fertilized eggs that will de2velop step by step into sophisticated organisms consisting of multiple tissues and organs.
人类和动物生命周期都从受精卵开始 然后一步一步地发育成具有多元组织和器官的生物体 。
Life cycle of human and animals starts from single fertilized eggs that will de2velop step by step into sophisticated organisms consisting of multiple tissues and organs.
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