QQuestionBiology
QuestionBiology
Which definition describes endosymbiosis best?
A. A symbiotic relationship in which one organism lives on the other organism and both organisms benefit.
B. A symbiotic relationship in which one organism lives inside the other and both organisms benefit.
C. A symbiotic relationship in which one organism benefits, while the other organism is harmed.
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Answer
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Step 1:I'll solve this biology problem step by step:
Step 2:: Understanding Symbiosis
Symbiosis is a close, long-term interaction between two different biological species. There are several types of symbiotic relationships, each with distinct characteristics.
Step 3:: Analyzing the Term "Endosymbiosis"
- "Endo-" is a prefix meaning "within" or "inside" - "Symbiosis" refers to a close relationship between two organisms - Therefore, endosymbiosis specifically describes a relationship where one organism lives INSIDE another organism
Step 4:: Evaluating the Answer Choices
A. Incorrect - This describes organisms living ON each other, not INSIDE each other B. Correct - This precisely defines endosymbiosis: one organism living inside another, with mutual benefits C. Incorrect - This describes a parasitic relationship, where one organism benefits at the other's expense
Step 5:: Providing Context
Endosymbiosis is a critical concept in evolutionary biology. A famous example is mitochondria in eukaryotic cells, which were originally independent bacteria that began living inside other cells, eventually becoming essential cellular organelles.
Final Answer
A symbiotic relationship in which one organism lives inside the other and both organisms benefit.
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