They live on land.
They live in water.
They have a backbone.
They have no backbone.
Animals that are accustomed to the water and live in places with high moisture.
Animals that do not need liquid to survive eat more food.
Animals that feed on microscopic bacteria to survive.
Animals that will one day have a notochord.
Its body temperature changes depending on how much nutrients it eats.
Its body temperature changes depending on the season.
Its body temperature changes depending on the weather.
Its body temperature changes depending on its environment.
The fish first swallows the water before it gets to the gills.
Gills have many blood vessels in them.
The gills release carbon dioxide after respiration into the water.
The gills transport oxygen from water into blood.
Jawless, cartilaginous, and bony
Bobber, hellgramite, dobsonfly
Sea, lake, and river
Reef, free swimmer, and sinkers
An animal that begins their life in the water but spends their adult life on land. They usually only return to water to reproduce.
An animal that begins their life on land but spends their adult life in water. They usually only return to land to reproduce.
An animal that goes through a metamorphosis without a cocoon.
Tadpoles are herbivores, while adults are carnivores.
Tadpoles are herbivores, while adults are omnivores.
Tadpoles are omnivores, while adults are herbivores.
Tadpoles are omnivores, while adults are carnivores.
They are all carnivores.
They can live all their life on land.
They sleep in only warm places.
All of the above.
We have determined their descendants and ran aging tests on them.
We don't. The government makes it up to fill gaps.
We have fossils to show us body structure and other details.
There is one remaining one left that scientists test on.
Here's an interesting quiz for you.