5/7 & 5/8 - 7th Grade Agenda Learning Objective: Learn about Vertebrates Collect HW: Reading Guide Section 4 & 5 Video: Life in the Undergrowth Microviewer Lab (Cell Structures 58) Textbook Reading 456 – 458 HW: Reading & Notetaking 220 – 221 Reminder: Chap 11 Test on 5/12 & 5/13

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

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 do Fish obtain Oxygen? Fish obtain oxygen in the water through its gills

Do 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)