This word describes a group that includes all of the descendants of a common ancestor MINUS one or more groups. Another example is the reptile group which includes all amniotes except for mammals and birds.
Paraphyletic
100
This is why it is difficult to study extinct species of shark.
What is their skeletons are made of cartilage, so only their teeth can be fossilized.
100
This adaptation allows some fish to breath out of water and still exists in this group of fish today.
What is lungs and lungfish.
100
As opposed to fish, amphibians have an extra ______ in their heart that receives blood from the body.
What is an atrium.
100
Frogs and toads belong to this Order of animals.
What is Anura
200
This is one example of an animal in the group Chondricthyes.
What is any shark or ray.
200
This group of sharks is named after its propensity to stay on the bottom of the ocean but it also includes whale sharks.
What is a carpet shark
200
Amphibians, reptiles, mammals and birds form a monophyletic group with fish that have this certain type of fin.
What is lobe-finned fish.
200
These three differences separate a tadpole from a frog.
What is gills, two chambered heart, tail, diet.
200
This group of animals have special fused skulls to allow them to burrow into the ground.
What is Apoda
300
This group includes fish that have a bony skeleton.
What is Osteichthyes
300
This is the reason that sharks are able to replace lost teeth so easily.
Their scales are teeth.
300
The inability to do this still ties amphibians to their roots in the water.
What is lay eggs out of water.
300
This is what scientists believe the early ancestors of amphibians used their legs for.
To navigate through branches in shallow water.
300
This group of animals includes the largest living amphibian today.
What is Urodela
400
This group of fish includes Lampreys and Hagfish.
What is Agnatha
400
Sharks give up the ability to bite hard in order to be able to do this with their jaws.
What is extend them out.
400
This lobe finned fish is the earliest known fish to have limbs.
What is Tiktaalik
400
Amphibian eggs lack this structure that protects the young in a fluid filled sack.
What is an amnion.
500
These animals would have to be included in order to make fish into a monophyletic group.
What is all tetrapods (amphibians, reptiles, mammals, and birds.)
500
Most sharks have this many gill slits (excluding carpet sharks)