Which mollusks have a closed circulatory system?Multiple choice question.GastropodsBivalvesCephalopods

Break Down the Problem

1. Identify the categories of mollusks mentioned.
2. Determine the circulatory system type for each category.

Relevant Concepts

1. Mollusks are primarily classified into three major groups:

   • Gastropods (e.g., snails and slugs)
   • Bivalves (e.g., clams, oysters)
   • Cephalopods (e.g., squids and octopuses)

2. Circulatory systems can be classified as:

   • Open circulatory system: Blood is not always contained in blood vessels.
   • Closed circulatory system: Blood circulates within a system of vessels.

Analysis and Detail

1. Gastropods: Generally have an open circulatory system where blood bathes organs directly in a hemocoel.
2. Bivalves: Also possess an open circulatory system similar to gastropods.
3. Cephalopods: They exhibit a closed circulatory system, which allows for more efficient transport of oxygen and nutrients. This is an adaptation to their active predatory lifestyle.

Verify and Summarize

Based on the analysis, only cephalopods possess a closed circulatory system among the options provided.

Final Answer

Cephalopods have a closed circulatory system.