10.ID: 10984846421 Abdominal organ that filters erythrocytes and activates lymphocytes spleen tonsils bone marrow thymus

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**Step 1: Understand the function described**  
We need to identify the abdominal organ that both filters erythrocytes (red blood cells) and activates lymphocytes.

**Step 2: Analyze the roles of the given options**  
- **Spleen:**  
  - Filters blood, removing old or damaged erythrocytes.  
  - Contains lymphoid tissue which activates lymphocytes.

- **Tonsils:**  
  - Located in the throat and serve primarily as a defense against inhaled or ingested pathogens.  
  - Do not filter blood.

- **Bone Marrow:**  
  - Site of hematopoiesis (production of blood cells), including erythrocytes and lymphocytes.  
  - Does not perform blood filtration.

- **Thymus:**  
  - Involved in T-lymphocyte maturation (activation and development of T-cells).  
  - Does not filter erythrocytes.

**Step 3: Match the function with the correct organ**  
The spleen is the only organ among the options that both filters erythrocytes and contributes to immune functions by activating lymphocytes.

**Final Answer:**  
$$ 	ext{spleen} $$
The spleen is the abdominal organ that filters erythrocytes and activates lymphocytes.

10.ID: 10984846421 Abdominal organ that filters erythrocytes and activates lymphocytes spleen tonsils bone marrow thymus

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