1. 5/19 & 5/20- 7th Grade Agenda
Learning Objective: Learn about mollusks & worms
Collect HW:Reading & Notetaking p.203 – 204
Squid Dissection Video
Video: BBC Life (Creatures of the Deep)
Textbook Reading 428 – 432
HW: Reading & Notetaking 205 – 206

2. Reflection
Prompt: Write 3 questions that you have about squids.

3. What some common properties of these animals?
What are Mollusks
What some common properties of these animals?
Mollusks are invertebrates with soft unsegmented bodies that are often protected by hard outer shells

4. Three major groups of mollusks
Gastropods (Single Shell)
Bivalves (Two Shells)
Cephalopods (Mollusks with tentacles)

5. Insides of a Squid

6. Comparing Mollusks

7. Do Mollusks have Open or Closed Circulatory System?
Mollusks have Open Circulatory System: Blood is not always in blood vessels

8. What are Gastropods? Gastro = “stomach” Pod = “Foot”
Gastropods are both herbivores and carnivores

9. Snail’s Radula
Tiny teeth act like sandpaper and scrape food from leaf and ground

10. How do you tell a female snail from a male snail?
You can’t. They are hermaphrodites. They have both male and female sexual organs.

11. Baby Snails are born with shells
Snail Eggs Baby Snail

12. Valve = “Shell or Opening”
What are Bivalves?
Bi = “Two”
Valve = “Shell or Opening”
Mostly Omnivores

13. How clams dig in

14. Most Clams don’t have eyes
But scallops has 50 – 100 simple eyes on the edges of the shell.

15. What are Cephalopods?
Cephalo = “Head”
Pod= “Foot”