Which of the following statements about eusociality is true?

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BlackTom AI · Accepted Answer

To address the question, I’ll evaluate each statement about eusociality and judge its accuracy based on current biological understanding.
Option 1: '100% of the eusocial organisms on Earth are insects, and the majority of them are bees.' This is incorrect because eusociality is not exclusive to insects; some crustaceans and invertebrates (like certain shrimp) exhibit eusocial behavior, though they are rare. Additionally, not all eusocial insects are bees; eusociality is also found in ants and termites. 
Option 2: 'The majority of eusocial species on Earth are insects, but there are a few eusocial mammals.' This statement reflects what is widely accepted: most known eusocial species are insects (particularly ants, bees, and termites), and there are indeed a few mammalian examples (notably the naked mole-rat and the Damaraland mole-rat) that form eusocial societies. This aligns with established data on the distribution of eusociality across taxa. 
Option 3: 'Every bee species is eusocial, only a handful of wasp species are eusocial, and those are the only eusocial organisms on Earth.' This is false because not all bee species are eusocial; many bees (like many solitary bees) do not exhibit eusocial colonies. Moreover, many other animals beyond a few wasp species can be eusocial, and there are eusocial organisms outside insects. 
Option 4: 'There are eusocial species among the birds, mammals, reptiles, amphibians, fish, and insects. Honey bees are one among thousands of species of eusocial organism on Earth.' This overstates the diversity across vertebrates; eusociality is extremely rare outside insects and a few mammals, but not observed in birds, reptiles, or fish broadly. While it correctly states that honey bees are among eusocial organisms, the claim that there are eusocial species across all major vertebrate groups is inaccurate. 
Synthesizing these assessments, we see that Option 2 accurately captures the correct pattern of eusocial diversity: insects constitute the majority of eusocial species, with a small number of eusocial mammals also present. The other options contain overstatements or inaccuracies about the distribution and prevalence of eusociality across taxa, or about which groups include eusocial species.

ENTOM2030/ENTOM2031 Post-Lecture 9 Quiz

Which of the following statements about eusociality is true?

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