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HESI BiologyWho benefits

Symbiosis & Species InteractionsHESI A2 cheat sheet

Who benefits

7 key facts 5 practice questions Reviewed Oct 2026
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Mutualism

  • Both species benefit
  • Gut bacteria and humans

Commensalism

  • One benefits, the other is unaffected
  • Barnacles on a whale

Parasitism

  • One benefits, the other is harmed
  • Tapeworm in an intestine

Others

  • Predation and competition shape populations too
Key takeaway

Who benefits

Before you read

Test yourself first: 5 questions

Question 1 of 5

Two organisms that can interbreed and produce fertile offspring belong to the same:

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