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Chondrictheys haven't changed much over the years. However, their jaws have changed to fit their prey and habitat as well as the shape and color of them.

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Chondrichtheys have traits that are passed down through time by their parents. Things like size and color are examples of traits that can be passed down.

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Sharks , rays, and skates have gone through micro evolution over time. The thing that mostly changed is their jaws. The reason for this is because sharks and rays had different prey long ago. Now they have different prey which causes their jaws to change shape as well as their teeth.

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- Sharks have non-connecting pectoral fins. Were stingrays and skates (triangular) are connected.
-Rays breath by sucking in water through their spiracles and exhaling it over their gills. Sharks either ram breath (swim through water passing it over their gills) or pull water through their mouths and over their gills.
-Rays flap their pectoral fins to swim or wiggle their bodies while sharks use their tails to propel themselves forward and use their pectoral fins to swim.

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Chondrichtheys have changed very little over the course of million s of years. Only small changes have occurred based on the habitat of that species of diet (which would change their teeth shape). Sharks, Rays and Skates are almost if not exactly the same as they were millions of years ago.

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In all chondrichtheys, multiple NOR(nucleolar organizer regions) bearing sites were found in the DNA. This is the particular part of the chromosomes where the nucleus is formed. Sharks have around 80 chromosomes where rays have around 66-90. This shows they all have common ancestors.

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Skeletons made of cartalidge , nicitating membrane( a protective eyelid ), dermal denticals , and internal reproduction are present in all chondrichtheys.

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Sharks, skates ans Rays all either lay eggs or give birth to live young. However, they all support the embryo through the nutrient of yolk and the placenta. All members of the chondrichthye family fertilize internal.

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Chondrichtheys have changed very little over time. They still have the same general shape and are still made of the same thing. Looking at fossils of sharks like helicorpian (290 mya) and Stethacanthus (323.2 mya) show they have different characteristics that served their purpose at that time. Just like certain sharks today that eat certain thing have differently shaped teeth.

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They all have the same classes up until chondrichtheys. This shows they are built of the same material (cartilage) and share other characteristics.

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K- Animalia
P- Chordata
C- Chondrichtheys
O-Rajiforms
F- Rajidae
G- Raja
S- R. undulata

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K- Animalia
P- Chordata
C- Chondrichtheys
O-myliobatiforms
F-dasyatidae
G-neotrygon
S-neotrygon kulii

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EDS-23 Blue spotted stingray, Taeniura lymma 1

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K-animalia
P- chordata
C-chondrichthyes
O-squaliforms
F-somniosidae
G-somniosus
S-microcephalos

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Sharks, Rays, and Skates all share similar external, internal, behavioral, and habitat characteristics.
-cartridge skeletons
-movable jaws
-paired fins
-skin (sandpaper)
-gas obtained by the gills and water flow
-most live in salt water
-eat fish or small crustations.