5/17 & 5/18 - 7th Grade Agenda

Learning Objective: Learn about FishCollect HW: Reading & Notetaking 219 – 222Who wants to be a MillionaireChap 11 TestClasswork: “Scientific Names”Video: BBC Life “Challenges of LIfe”Textbook Reading 462 – 467HW: Reading & Notetaking 223 – 226

Annular Eclipse: May 20th (Sunday)

• 6:38pm

• 78% of the sun covered up by the moon

Annular Eclipse: May 20th (Sunday)

• You can not stare directly at the sun

• You must wear Eclipse glasses

• You can order them from Amazon or rainbowsymphonystore.com

• 5 Extra credit points if you take a picture of you watching the eclipse with Eclipse glasses

Reflection

• Prompt: Write 3 questions that you have about frogs.

What type of animal is a vertebrate?

• Fish• Sharks• Reptiles• Amphibians• Mammals• Birds

What do all Vertebrates share in common?

• Backbone• Endoskeleton• Endoskeleton allows

an animal to become larger than Exoskeleton. Why?

Skeleton of a Seal

One of the most primitive Vertebrate - Lancelet

• Notochord: Flexible rod that supports the animal’s back

What is Ectotherm vs. Endotherm

• Ecto (Outer) + Therm (Heat) = Gets the heat from the outside. Cold blooded

• Examples of Ectotherm animals: Fish, Amphibian & Reptiles

• Endo (Inner) + Therm (Heat) = Gets the heat from the inside. Warm blooded

• Examples of Endotherm animals: Mammals & Birds

Fish without jaws - Lampreys

Cartilaginous Fishes – Sharks and Rays

Bony Fish

What are the characteristics of Fishes?

• Vertebrate• Live in water• Have Fins• Ectotherm (cold

blooded)• Have Scales• Obtain oxygen

through gills

How does Fish obtain Oxygen?

• Fish obtain oxygen in the water through its gills

Does Fish break down H2O into Hydrogen and Oxygen?

• Fish do not break H2O into hydrogen and oxygen.

• There is oxygen gas dissolved in the water. • Their gills extract this oxygen gas out of the

water and return CO2 just as our lungs do. • What would happen to the fish if there was no

oxygen in the water?

Most fishes have external fertilization

• In external fertilization, the eggs are fertilized outside the female’s body.

• The male hovers close to the female and spreads a cloud of sperm cells over the eggs she releases

• There are exceptions – Guppies, Mollies (Live birth)

Amphibians evolved from Fish

• Mudskipper Fish (Type of Goby Fish)

• It can live out of water for long periods

• It can breath through its skin just like Amphibians

What are Amphibians?

• The word amphibian means “double life”

• After beginning their lives in water

• Most amphibians spend their adulthood on land

• Returning to water to reproduce.

Life cycle of an Amphibian

Do tadpoles have lungs or gills?

• Gills

Do frogs have lungs or gills?

• Lungs