# data[].attributes.body
Characteristics
All have body covered with fur
Breathe from lungs
Milk production
Keratin hair
Live births
Endothermy
Major Groups
Pinnipedia
Carnivora
Sirenia
Cetacea
Pinnipedia- Predators that feed mainly on fish. Streamlined bodies for swimming
Carnivora- Dense fur for insulation
Sirenia- Pair of front flippers but no rear limbs. Herbiores.
Cetacea- Spend entire life in water. Consists of having a blowhole.
Amatomical characteristics
Four chambered heart
Large craniums
Life Cycles
- Born from eggs
- Grow into adolescence
- Transition into adulthood and reproduce

# data[].attributes.body
https://youtu.be/qRKoGO7hNXg

# data[].attributes.body
Characteristics
-100 species
-Skeletal of cartilage
- Movable jaws with developed teeth
- paired fins
Major Groups
- Sharks, Skates, and Rays
How they are different
- Sharks have two dorsal fins and are carniverous. Skates have a fleshy tail with no spine on tail. Rays have thin tail with no spine
Anatomical Characteristics
- 5-7 gill slits
- Spiracles in many species
- Males in most species have projections of anal fin called claspers.
Life Cycles

Sharks have a live birth while other cartalaginous fish lay eggs.

# data[].attributes.body
Characteristics
No teeth. Use gizzard to grind up food. Has hollow bones. Feathers are made of keratin. Front limbs are adapted as wings
Major Groups
Strisores
Gruiformes
Inopinaves
How groups are different
Strisores- nocturnal birds
Gruiformes- "crane like". Geographical diversity.
Inopinaves- lands birds and predatory such as hawks and falcons
Life Cycles
Born from eggs. Kept warm by parents until they hatch. After they hatch they are trained to fly and fed directly by parents.

# data[].attributes.body
Characteristics
Lightweight skeleton made of calcium
Thin-flexible scales
Major Groups
Ray Finned fish and Lobe finned fishes
How groups are different
Ray Finned fish- can be further divided into soft rayed and spiny rayed fish
Lobe finned- mostly extinct but include lungfishes and coelcanths
Anatomical characteristics
Cycloid scales, Ctenoud scales, Operculum
Life Cycles
Start in embryo and hatch as larva. When they become adults they begin to fertilize eggs

# data[].attributes.body
Characteristics
Obtain oxygen throughlungs. Lay shelled amniotic eggs. Regulates body temperature. Cold blooded.
Major Groups
Testudines
Squamata
Crocodilia
How groups are different
Testudines- Shell made of cartilage that is made from their ribs
Squamata- Scaled animals that consists of lizards and snakes
Crocodilia- Semi aquatic reptiles
anatomical characteristics
Mostly cartilage structure
Keritin scales
Ectothermic
Life Cycle
Begins at the egg and they hatch. Progress to juvenile and sexually mature into adults