# data[].attributes.body
Characteristics: milk, hair, endothermy, live births, placenta,
Major Groups within Class: Cetaceans
Distinction of how groups are different
whales, dolphins, porpoises
Important Anatomical Characteristics
placenta, uterus, large cranium, skeletons made of bone, bear live young
Important life cycles within groups
reproduce sexually and give live birth. Produce milk from mamaries
Media about the groups (video, pictures, web sites)

# data[].attributes.body
Characteristics:  evolution to flight, gizzard, hollow bones, feathers
Major Groups within Class

Distinction of how groups are different: Groups have different beak shapes and wing structures/ sizes
Important Anatomical Characteristics: Endothermic for increased metabolism.,Four chambered heart is efficient in blood circulation.,One way air flow in respiratory track., Large Keel to anchor pectoral muscles.

Important life cycles within groups
Amniotic egg with a calcareous shell
Media about the groups (video, pictures, web sites)

# data[].attributes.body
Characteristics: keratin scales, lay shelled amniotic eggs, exothermic

Major Groups within Class:  sea turtles(testudines) , sea snakes(Squamata), sea iguana, and crocodiles (crocdilia)

Distinction of how groups are different: Sea turtles are fully aquatic but breathe air, sea snakes are the largest group of saltwater reptiles, sea iguanas eat only aquatic vegetation, salt water crocodiles have a special gland which allows them to remove excess salt from their body

Important Anatomical Characteristics
diagram

Important life cycles within groups
Reptiles lay eggs.  reproduce through sexual reproduction.  Amniotic egg: The development of many membranes for use in gas exchange, water storage and the transfer of nutrients.

Media about the groups (video, pictures, web sites)
https://www.youtube.com/watch?v=DefLKnKyQfA

# data[].attributes.body
Characteristics:  skeletons made of cartilage, paired fins, paired nares, hearts chambered in series

Major Groups within Class: Galean Sharks, Squalomorph Sharks, Rays, and Holocephali

Distinction of how
groups are different: Galean:  Open water sharks, Squalomorph: lacking an anal fin, lacking a nictating membrane (eye membrane), Rays:  flattened bodies, enlarged pectoral fins Holocephali: lack a stomach, smaller in size

Important Anatomical Characteristics: gill slits, anal fin, lateral line, refer to diagram

Important life cycles within groups
Cartilaginous fish reproducein different ways some have live birth (known as vivipary); some lay egg cases (ovipary); while others have an internalized egg that hatches while still in the female before the young are expelled from the female’s reproductive system (ovovivipary)
Media about the groups (video, pictures, web sites)
https://www.youtube.com/watch?v=vrkkQO9zVfA

# data[].attributes.body
Characteristics:

Major Groups within Class: Ray finned, lobe finned, lung fish

Distinction of how groups are different
Ray Finned Fish: have spines that protrude into the fin for support
Lobe Finned Fish: have fins that are supported by skeletal extensions.
Lung Fish: have the ability to gulp air into lung sacs connected to the digestive system but mainly use gills for gas exchange.

Important Anatomical Characteristics
ossified endoskeletons, scaly skin, lateral line, operculum, oviparious

Important life cycles within groups
Bony fish reproduce through egg laying

Media about the groups (video, pictures, web sites)