`{:("Phylum","Level of organisation","Digestive system","Respiratory system"),("Aschelminthes","A","Complete","Absent"),("Echinodermata","Organ system","B","Present"),("Platyhelminhes","Organ","Incomplete","C"),("Annelida","Organ system","Incomplete","D"):}`
Select the option with correct identification of A, B, C, and D.

Options

A. A - organ, B - Complete, C-Present, D- Absent
B. A - organ system, B - Complete, C - Absent , D - Absent
C. A - organ system, B - Incomplete , C- Absent, D - Present
D. A - organ system, B - Incomplete , C - Present , D - Absent

Answer

To solve the question, we need to identify the correct options for A, B, C, and D based on the characteristics of the specified phyla. Let's break it down step by step:

### Step 1: Identify A (Level of Organisation for Aschelminthes)
- Aschelminthes, also known as pseudocoelomates, exhibit an organ system level of organization.
- **Conclusion**: A = Organ system

### Step 2: Identify B (Digestive System for Echinodermata)
- Echinodermata possess a complete digestive system, which means they have a distinct mouth and anus, allowing for a more efficient digestion process.
- **Conclusion**: B = Complete

### Step 3: Identify C (Respiratory System for Platyhelminthes)
- Platyhelminthes, or flatworms, do not have a specialized respiratory system. They rely on diffusion through their body surface for gas exchange.
- **Conclusion**: C = Absent

### Step 4: Identify D (Respiratory System for Annelida)
- Annelids, such as earthworms, also lack a specialized respiratory system. They respire through their moist skin, which allows for gas exchange directly with the environment.
- **Conclusion**: D = Absent

### Final Summary:
- A = Organ system
- B = Complete
- C = Absent
- D = Absent

### Correct Identification:
Thus, the correct option for A, B, C, and D is:
- A: Organ system
- B: Complete
- C: Absent
- D: Absent

### Answer:
The correct identification of A, B, C, and D is:
- A = Organ system
- B = Complete
- C = Absent
- D = Absent