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The open circulatory system is found in...

The open circulatory system is found in

A

earthworm

B

cockroach

C

snail

D

both (2) and (3)

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### Step-by-Step Solution: 1. **Understanding Circulatory Systems**: - There are two main types of circulatory systems: open and closed. - In an open circulatory system, the fluid (hemolymph) is pumped through vessels and then directly empties into the body cavity. - In a closed circulatory system, blood circulates through a network of vessels and returns to the heart. 2. **Identifying Organisms with Open Circulatory Systems**: - The question asks which organisms possess an open circulatory system. - Common examples of organisms with an open circulatory system include arthropods (like cockroaches) and members of the phylum Mollusca (like snails). 3. **Analyzing the Given Options**: - **Option A: Earthworm**: Earthworms belong to the phylum Annelida and have a closed circulatory system. Therefore, this option is incorrect. - **Option B: Cockroach**: Cockroaches are arthropods and possess an open circulatory system. This option is correct. - **Option C: Snail**: Snails belong to the phylum Mollusca and also have an open circulatory system. This option is correct. - **Option D: Both 2 and 3**: Since both the cockroach and snail have open circulatory systems, this option is also correct. 4. **Conclusion**: - The correct answer to the question is **Option D: Both 2 and 3**, as both cockroaches and snails exhibit an open circulatory system.
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