A
The organisms can reproduce by producing a copy of their cell either by binary fission, mitosis or budding. Because they are only made of one cell, they do not require complex reproduction mechanisms hence can double their population in very short time. An example is bacteria cells.
Explanation:
Another reason they can produce so quickly is their unicellular nature provides a large surface area to volume ratio to quickly gather nutrients from their environment and rapidly excreting toxic byproducts to sustain a high rate of biochemical processes.
Learn More:
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