Longest-Living Biological Organisms
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Questions and Answers

What complicates the determination of an organism's natural lifespan?

  • The capability of some organisms to reproduce through long periods of metabolic dormancy
  • The observed decrease in mortality rate with age for some species
  • The ability of a species to regress to a larval state and regrow into adults multiple times
  • Practical difficulties in measuring age for extremely old organisms (correct)

    • What does it mean for a species to be biologically immortal?

  • The mortality rate increases after maturity
  • The species does not age and the mortality rate remains constant after maturity (correct)
  • No natural limit to its lifespan is known
  • The observed decrease in mortality rate with age for all or part of the life cycle

    • Which organism is mentioned as capable of cycling from a mature adult stage to an immature polyp stage and back again?

  • Laodicea undulata
  • Aurelia sp.1
  • Hydra
  • Turritopsis dohrnii (correct)

    • What is a challenge in estimating the age of the hydrozoan species Turritopsis dohrnii?

    <p>It is difficult to observe a single specimen for an extended period</p> Signup and view all the answers

    What can be repeated but results in physiological deterioration for skin beetle larvae?

    <p>Cycling from a mature adult stage to an immature polyp stage and back again</p> Signup and view all the answers

    Which definition of 'longest-living' is considered in the article?

    <p>The age of the oldest known individuals currently alive</p> Signup and view all the answers

    What is excluded from the definition of 'longest-living' in the article?

    <p>The length of time between the earliest appearance of a species in the fossil record and the present</p> Signup and view all the answers

    What does the article define as the 'longest-living' for a given species?

    <p>The individual with the longest natural maximum life span</p> Signup and view all the answers

    What is NOT considered in the article's definition of 'longest-living'?

    <p>The geographical distribution of the species</p> Signup and view all the answers

    What type of individuals are considered in the article's definition of 'longest-living'?

    <p>The oldest known individuals currently alive with verified ages</p> Signup and view all the answers

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