Chondrichthyes

What is the main defining feature of the Chondrichthyes

• Their powerful jaws

• Their Cartilaginous

  endoskeleton

• Their lack of a swim bladder

Answer explanation

They did have an interesting and powerful jaw but their main defining feature is their skeleton

What is a special way mentioned in the video that sharks have buoyancy

• They have non they just stay active

• They have oil in their liver that is lighter than water

• They have oil in their skin that is lighter than water

Answer explanation

Only some sharks have this capability

What does a moveable jaw entail

• They don't have a fused jaw meaning that the muscles have free rein

• They have complete control over both of their upper and lower jaw

• They are able to extend their jaw out at will

What is the clade of Chondrichthyes

• Chondrichthyes

• Chordata

• Eugnathostomata

• Gnathostomata

Where are jaws believed to have been derived from

• Budda

• God

• Gill arches

• Gill covers