5/18 & 5/19 - 7 th Grade Agenda Collect HW: Reading & Notetaking 226 – 228 Collect Signed Grade...
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Transcript of 5/18 & 5/19 - 7 th Grade Agenda Collect HW: Reading & Notetaking 226 – 228 Collect Signed Grade...
5/18 & 5/19 - 7th Grade Agenda
Collect HW: Reading & Notetaking 226 – 228Collect Signed Grade PrintoutAmphibiansClasswork: Design your own speciesVideo: Life (Amphibians & Reptiles)Textbook Reading 486 – 494HW: Reading & Notetaking p.229 - 230
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
Salamander Larvae
Some Amphibians are Legless
• sdf• Caecilians
(pronounced seh-SILL-yens)
• No Legs• No scales• Usually Blind
Caecilians Larvae
What are reptiles
• Reptiles are ectothermic
• Has Scales• Lays eggs on land• The ancestors of
reptiles were the first vertebrates adapted to life completely out of water.
Amniotic ShellLets the air in and out and keeps
the embryo moist
Characteristics of Lizards
Can a turtle live outside it’s shell?
• No!• The shell is it’s rib and
backbone.
Characteristics of Mammals
• endothermic vertebrates • four-chambered heart • skin covered with fur or
hair. • Most mammals are born
alive• young mammal is fed
with milk
Do Dolphins have hair?
• Yes. Near their blow holes
• Most of the hair disappear when they get older
What are the function of hair and fur?
• Fur and hair prevent body heat from escaping
• Helps maintain a stable body temperature in cold weather
• Animals in cold regions have thicker coats of fur
When did the first mammals appear?
• About 270 Million years ago
• They were small mouse like animals
• After the dinosaurs disappeared about 65 million years ago, larger mammals evolved
You can tell the type of food mammals eat by its skull & teeth.• What type of food
does this animal eat?
You can tell the type of food mammals eat by its skull & teeth.• What type of food
does this animal eat?
Do some mammals lay eggs?
• Yes.• Monotremes lay eggs:• Two types of
Monotremes are: Spiny Anteaters & Duck billed platypus
What are Marsupials?
• Marsupials are mammals
• The young are born alive
• But at an early stage of development, they develop in a pouch on their mother’s body
Baby Kangaroo in mother’s pouch
What are Placental Mammals?
• Placental mammal develops inside its mother’s body
Diversity of mammals
• Most of the mammal species are bats and rodents