1. KINGDOM ANIMALIA - VERTEBRATES I don’t like you

2. I. KINGDOM ANIMALIA - VERTEBRATES Vertebrates: – Phylum Chordata – Notochord Firm flexible rod that provides support – Gill slits Take oxygen into the body and release CO2 – Endoskeleton Internal skeleton composed of bones, cartilage, or both

3. A. Class Amphibia Amphibians – Undergo metamorphosis – Ectotherms They get their internal body (absorb heat) temperature from their surroundings Also known as being “cold-blooded” – Three-chambered heart for circulation – Use external fertilization for reproduction – Ex: frogs, toads, salamanders

4. B. Class Mammalia Mammals – Use mammary glands to feed their young Produce milk – Use internal fertilization for reproduction Uterus: a specialized structure inside a female that allows an embryo to grow and develop – have a four-chambered heart for circulation – Endotherms They can keep a stable internal temperature Also known as “warm-blooded”

5. B. Class Mammalia Mammals – Mammals are divided based on how they reproduce 1. Placental Mammals – Placenta: an organ that passes nutrients and oxygen to and removes wastes from the embryo – Developing baby is connected to the placenta through an umbilical cord – 90% of mammals are placental mammals

6. B. Class Mammalia Mammals – Mammals are divided into 3 groups based on how they reproduce 2. Marsupials – Very short developing period inside the mother – After, period of development inside a “pouch” made of hair and skin outside the mother’s body – Opossum, koalas, kangaroos

7. B. Class Mammalia Mammals – Mammals are divided based on how they reproduce 3. Monotremes – Mammals that lay eggs – Spiny anteaters, duck-billed platypus