a notochord, a nerve cord that runs down their back, and slits in their throat area
100
Name the characteristics of fish.
They live in water, have fins, are ectotherms, obtain oxygen through gills & have scales.
100
What does amphibian mean?
"Double life."
100
The skin, kidneys, and eggs of reptiles are adapted to do what?
to conserve water.
100
What is an amphibian?
a vertebrate that is ectothermic and spends its early life in water
200
What can the endoskeleton do that an exoskeleton can't do
An endoskeleton doesn’t need to be replaced as the animal grows. Vertebrates can grow bigger than animals with exoskeletons or no skeletons at all because of this.
200
What is cartilage?
A tissue that is more flexible than bone.
200
What is an amphibian?
An amphibian is a vertebrate that is ectothermic and spends its early life in water.
200
Where do lizards and snakes live?
in hot climates
200
What is a swim bladder?
an internal, gas-filled sac that helps the fish stay stable at different depths in the water.
300
What do joints allow the vertebrates to have?
It gives the spine flexibility.
300
Name the major groups of fish.
Jawless fish, Cartilaginous fish & Bony fish.
300
How many chambers does a tadpole's heart have?
Two.
300
What helps alligators and crocodiles to swim fast?
strong, muscular tails
300
What is urine?
A watery fluid produced by the kidneys that contains wastes.
400
What is an endotherm?
An animal whose body controls and regulates its temperature by controlling the internal heat it produces.
400
Name three types of cartilaginous fish.
Sharks, rays, and skates.
400
What is the larva of a frog or toad called?
Tadpole.
400
What animal was the earliest vertebrate?
dinosaurs
400
What is a ventricle?
A lower chamber of the heart that pumps blood out to the lungs and body
500
What is the difference between an endotherm and an ectotherm?
An ectotherm produces internal heat, and endotherm controlls internal heat.
500
What helps fish find food & avoid predators?
The Nervous System.
500
What are the respiratory and circulatory systems of adult amphibians adapted for?
Life on land.
500
What does a paleontologist study?
extinct organisms, and fossil structures
500
What is an amniotic egg?
An egg with a shell and internal membranes that keep the embryo moist; a major adaptation to life on land characteristic of reptiles, birds, and egg-laying mammals.