In biology, life cycle is the series of changes that an organism undergoes from its inception by means of reproduction, whether through asexual reproduction or sexual reproduction, to the inception of the following generation in that same phase of the cycle.
For some organisms, particularly small, simple organisms such as bacteria and some protists, the life cycle is complete in one generation. This is also the case for many animals, where the male and female gamete fuse to form the new offspring. In plants, reproduction is multi-generational, also known as alternation of generations.
While life cycle types can be placed into a few broad categories (haplontic, diplontic, etc.), the specific life cycles of individual species show great diversity, such as the timing of the onset of various stages, methods of fertilization, and so forth. Diversity among living organisms is a basic biological principle and an important component in the joy humans experience from nature. Of course, organisms in closely-related species and taxa share similar life cycles. The near ubiquitous presence of sexual reproduction, combined with genetic recombination, promotes uniqueness among individuals as well.
In biology, life cycle is the series of changes that an organism undergoes from its inception by means of reproduction, whether through asexual reproduction or sexual reproduction, to the inception of the following generation in that same phase of the cycle.For some organisms, particularly small, simple organisms such as bacteria and some protists, the life cycle is complete in one generation. This is also the case for many animals, where the male and female gamete fuse to form the new offspring. In plants, reproduction is multi-generational, also known as alternation of generations.While life cycle types can be placed into a few broad categories (haplontic, diplontic, etc.), the specific life cycles of individual species show great diversity, such as the timing of the onset of various stages, methods of fertilization, and so forth. Diversity among living organisms is a basic biological principle and an important component in the joy humans experience from nature. Of course, organisms in closely-related species and taxa share similar life cycles. The near ubiquitous presence of sexual reproduction, combined with genetic recombination, promotes uniqueness among individuals as well.
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