Where do they snakes and lizards live? What are examples of their food and what they eat? 
 Lizards live in woodland areas, African deserts, or in rainforests. They eat many different kinds of meat like smaller animals. Snakes live in many of the same places, but do not live in New Zealand. Snakes also eat small animals, but some can eat insects. Snakes and lizards are very closely related.
What type of circulatory system do these animals have?   Snakes and lizards have a simple circulatory system. For the most part they are not known for moving a lot. They usually sit, make minor movements, or eat. They sleep a lot of their time also. Snakes and lizards are also excellent at hunting prey.
How do these animals digest their food? Do they have a complete digestive system? 
Snakes and lizards are mainly meat eaters, but some snakes and lizards eat plants. They are terrible chewers of food. They swallow their food whole. Snakes have fangs which are used to inject poison, but not used to chew. Their stomachs break it down and special acids help break it down.
Snakes and Lizards
How are these animals unique? Snakes and lizards are really unique animals. They have a lot of cools attributes about them. Snakes lay 20-30 eggs at one setting. After they have babies they show no parental care for them. Some snakes even eat each other. Lizards smell mostly by tasting things. They even squirt blood out of their eyes!
How do they support their shape? Believe it or not, snakes do have a skeleton. It's a very light one that allows them to move freely. It is also set very loose set at the rib cage so that they can swallow large prey. (Their dinner is usually really big!) They say their skeleton is almost invisible.
How do they get oxygen and get rid of carbon dioxide? People often wonder how snakes get oxygen. And that I will answer. They have muscles attached to their ribcage that enables their lungs to inflate and deflate. This brings oxygen in and carbon dioxide out. It's almost easier and more efficient than how we breathe and exhale.
How do these animals reproduce?
What is the life cycle like? Mating season is in spring. The male will approach a female with no certain selection. They use their tongues to detect pheromones given off by the other snake to determine the sex, species, and readiness of the animal. They will then curl up in a ball around the female. Afterward they will lay eggs that will hatch within a few days.
What type of excretory system do these animals have? They have ammonia. They drink very large amounts of water. After that it dilutes the ammonia and helps it carry out through the body. It clears out all the defects of the body amd also makes things go smoothly.
What are some examples of this group of animals? Comodo dragon, king cobra, garter snake, viper, rattlesnake, and boaconstrictors. There are bull snakes, hognose, and pythons. There's copperheads, water moccasins,  fer-de-lance, and bushmasters. Snakes with bright colors and snakes that are camoflauge colored.
How are these animals important to humans and the environment? Lizards and snakes are important to humans and the world. Lizards have been used for movies and music group names. They also are used to promote thing. In India snakes are worshiped. They believe that cobras are the reincarnations of important chiefs. The skin of snakes is used for many different things. Such as snake skin clothes and accessories.
What is their nervous system like? Do they have specific sensory structures? The system of nerves known as the nervous system is similar for both snakes and lizards. The nervous system includes the brain, spinal cord, and nerves. The Lizards brain is more advanced than other amphibians or fish. They have a large cerebrum and cerebellum. There are cranial nerves. The spinal cord extends to the tip of the tail. Snakes brains are very similar. Their brain is less than 1/1,500 of their total body weight.
The amniotic egg. An amniotic egg is for both lizards and snakes. It helps protect the egg and the inside. It protects against shock. Chorion aids in gas exchange. Allantois helps store nitrogenous waste. Inside the egg are a many of fluid-filled membranes which help the embryo to survive.
What purpose does the snake "tongue-flip" serve? A snake flipping its tongue actually serves as a purpose. When they stick out their tongue they taste the environment around them. The tip of their tongue picks up molecules from the air. They do this to know what is around them. It gives them and idea and better feel for what is going on.
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Desert Lizard
Desert Lizard squirting blood out of it's eyes.
Snake eating an egg.