5/19 & 5/20- 7th Grade Agenda Learning Objective: Learn about mollusks & worms Collect HW:Reading & Notetaking p.203 – 204 Squid Dissection Video Video:

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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

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

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

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

Insides of a Squid

Comparing Mollusks

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

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

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

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.

Baby Snails are born with shells Snail Eggs Baby Snail

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

How clams dig in

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

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