4/20- 7th Grade Agenda Learning Objective: Learn about life in the deep ocean. Collect HW: Reading & Notetaking 197 – 200 Drug Prevention Outreach program (Cigarette Smoking) Textbook Reading 424 – 427 HW: Reading & Notetaking p.203 - 204

Reflection Prompt: Write 3 questions that you have about creatures living at the bottom of the ocean.

Reflection Prompt: Write 3 questions about cigarette smoking.

What are the major type of worms Flatworms Roundworms Segmented Worms

Lifecycle of a tapeworm

An organism that lives inside or on another organism and takes its food from that organism is a P_______ arasite

Do worms have brains? Yes They also have a heart, digestive tract and reproductive organs

How do Earthworms Mate? Earthworms are hermaphroditic meaning each worm has organs of both sexes. One worm has to find another worm in order to mate

Do earthworms have eyes? They do not have eyes But they do possess light- and touch-sensitive organs (receptor cells) to distinguish differences in light intensity and to feel vibrations in the ground.

What is the "bump" in the middle of the earthworm? The bump is the clitellum. It contains the gland cells which secrete a slimy material (mucus) to form the cocoon which will hold the worm embryos.

Earthworm Cocoons

Can earthworms regenerate themselves? Yes, but only the front or head end of the earthworm will survive and the amputated tail portion will die.

Virtual Dissection of Earthworm

What is the difference between front end and back end? Front End (Anterior) Back End (Posterior)

What is the difference between top side and bottom side? Top side (Dorsal) Bottom side (Ventral)

Dissecting the earthworm

Internal View

Aortic Arches (Primitive Heart)

Cross section view

Does earthworm have bilateral or radial symmetry? Bilateral Symmetry