Birds
_____ are structures that enable birds to fly.
Wings.
Fish use specialized organs called _____ to take in the oxygen dissolved in water.
Gills.
How many chambers does an amphibian heart have?
3.
The four modern groups of reptiles include; sphenodonts, snakes / lizards, crocodilians, and _______.
Turtles.
Earth's first mammals appeared more than ___ million years ago.
200.
Are birds endotherms or ectotherms?
Endotherms.
How do lampreys get nutrients?
Suckers latch on to other fish and feed on their blood.
_____ make up the largest group of living amphibians, with more than 3000 species.
Frogs.
A reptile's heart has two _____ and one _________.
Atria and Ventricle.
The placenta is a membranous organ that develops in female mammals during _________.
Pregnancy.
Feathers are complex branching structures made of _______.
Keratin.
What is the function of the swim bladder?
Maintain neutral buoyancy.
Why must amphibians live near a water source?
They must keep themselves and their eggs moist.
The first amniotes walked in a sprawl similar to that of the ______.
Lizard / Komodo Dragon.
Mammals have _____ small bones in their middle ear.
Three.
What are the two scientific hypotheses for the origin of flight in birds?
Trees-down and Ground-up.
To which vertebrate class do rays and sharks belong?
Chondrichthyes.
In an adult amphibian, what is waste expelled through?
Cloaca.
Which type of reptiles deposit their eggs into an external nest so that the eggs can develop independently?
Oviparous reptiles.
Fossil evidence suggests that early mammals had long _____ and short ____.
Noses and Legs.