Mississippi Science ZOO.3.2
The Standard
- ZOO.3
- Students will understand the structure and function of phylum Mollusca, and how they adapt to their environments.
Describe why mollusks are classified as eucoelomates.
2026 Mississippi College- and Career-Readiness Standards for Science · Phylum Mollusca
Teacher's field guide
What This Standard Means
What Students Need to Do
- Students identify a true coelom as a body cavity lined by mesoderm. They explain that mollusks have a small coelom around the heart, even though much of their internal space is a hemocoel.
What Mastery Looks Like
- Given a mollusk anatomy diagram, a student points to the cavity around the heart and identifies its mesoderm lining. They explain why the larger hemocoel does not count as a true coelom.
Common Misconceptions
- Students may mistake the space inside a shell for a coelom. They may also think the hemocoel is a true coelom, or that a small coelom does not count.
How to Assess It
- Give students a labeled clam diagram. Ask: “Which space shows that this animal is a eucoelomate? Name the tissue that lines it.”
Lesson moves
Ways to Teach It
Build a clay mollusk cross-section, using one color for the mesoderm lining around the heart and another for the hemocoel.
Ask students to write two sentences explaining why a snail qualifies as a eucoelomate despite having a large hemocoel.
Sort cavity diagrams into true coelom and not true coelom piles, then check each choice for a complete mesoderm lining.
Use a labeled clam dissection photo to find the heart's surrounding cavity and explain how a zoologist would classify the clam.
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Related Standards
- ZOO.3
Students will understand the structure and function of phylum Mollusca, and how they adapt to their environments.
- ZOO.3.1
Considering the diversity of mollusks, explain how they all share a common body plan (i.e., mantle, visceral mass, and foot).
- ZOO.4.5
Describe the evolutionary importance of the segmented body plans of annelids.
- ZOO.6
Students will understand the structure and function of phylum Echinodermata, and how they demonstrate the characteristics of living things.
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