Some biologists argue that multicellularity arose only once, while others feel it arose several times.Cite a few reasons why each group holds its particular view.
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Explanation:
If multicellularity comes so easy, why did it take several billion years after the origin of life for complex organisms to become firmly established? Traditionally, researchers have blamed the early atmosphere's low oxygen levels: To get enough oxygen, organisms needed the highest possible ratio of surface to volume, which forced them to stay small. Only after oxygen levels rose about 1 billion years ago could larger, multicellular organisms arise.
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There has been a debate on the topic that multicellularity arose only once.
Explanation:
- This is true because in case of the organisms more primitive the organism more is the number of cells which is present in the body of that organism. In addition to this higher organisms have much developed system due to which multicellular it is required.
- however multicellularity is an acquired phenomena and it required thousands of years for mutation to take place to change from unicellular or multicellular organism.
- The debatable topic is that there are certain exceptions in protista which are multicellular but have different diverse functions.
To know more about multicellular organism,
how does presence of tissue help multicellular organism to survive ..
.https://brainly.in/question/14830838
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