All members of this phyla are called this and most of them are vertebrates
What is chordates?
100
Most fish are this which means an animal whose body does not produce much internal heat.
What is an ectotherm?
100
This animal is a vertebrate that is ectothermic, spends its early life in water, spends most of its adult life on land, and most return to the water to reproduce.
What is an amphibian?
100
This is an ectothermic vertebrate that has lungs and scaly skin.
What is a reptile?
100
_____ are most often found in sedimentary rock.
What are fossils?
200
This is what vertebrate means.
What is has a backbone?
200
In contrast to an ectotherm, this term describes an animal whose body regulates its own temperature by controlling the internal heat it produces.
What is an endotherm?
200
The larva of a frog or toad is called . . .
What is a tadpole?
200
The skin, kidneys, and eggs of reptiles are adapted to do this.
What is conserve water?
200
By studying fossils, paleontologists can infer . . .
What is how a species changed over time?
300
The phylum name Chordata comes from this word when means a flexible rod that supports a chordate's back.
What is notochord?
300
The three major groups of fishes are ...
What are jawless fishs, cartilaginous fishes, and bony fishes?
300
These are the two parts of the amphibian heart that push blood throughout the body.
What are atrias and ventricles?
300
This is the name for an egg with a shell and internal membranes that keep the embryo moist.
What is an amniotic egg?
300
______ are scientists who study extinct organisms, examine fossil structure, and make comparisons to present-day organisms.
What are paleontologists?
400
This is another word for a vertebrate's backbone.
What is spine?
400
These are two characteristics that distinguish jawless fishes from other groups of fishes.
What are no jaws and no scales?
400
Amphibians start out with these oxygen gathering organs and through metamorphosis end up with these oxygen gathering organs.
What are gills and lungs?
400
The dinosaurs were the earliest vertebrates that had this adaptation that allowed them to move more easily than animals such as lizards and salamanders.
What is legs positioned directly beneath their bodies?
400
A ____ is the hardened remains or other evidence of a living thing that existed a long time ago.
What is a fossil?
500
A vertebrate has a backbone that is part of the internal skeleton and is formed by many similar bones called ...
What are vertebrae (plural)?
Vertebra is singlular.
500
Bony fishes have an organ inside their bodies that helps the fish stay stable a different depths of water. This organ is called . . .
What is a swim bladder?
500
This is the specific environment in which an animal lives.
What is a habitat?
500
_______ are the largest reptiles still living on Earth.
What alligators and crocodiles?
500
What are two ways scientists estimate the age of fossils?
What are the position of the fossil in the sedimentary rock and the radioactive decay of elements?