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 (B)</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 (B)</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 (B)</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 (A)</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 (D)</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 (C)</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 (A)</p> Signup and view all the answers

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