Do lizards have eyelids? Do snakes have eyelids? Notice the bony matrix that und
ID: 176771 • Letter: D
Question
Do lizards have eyelids? Do snakes have eyelids? Notice the bony matrix that underlies the scutes of the turtle carapace. What bones compose the carapace and how are they modified from other reptiles? Describe the predatory adaptations of the hawk beak, and feet. What features suggest that birds have a reptilian origin? How many heart chambers in birds? Note the teeth of the dolphin-do they have teeth differentiated for specialized functions like our teeth and most other mammals? Explain. For what are their teeth adapted? How is the bat hand adapted to flight? How is the orientation of the foot different from our own? Do you suppose they walk well? Explain. How are antlers different from horns?Explanation / Answer
1. Yes. Lizards have eyelids. Only the lower eyelid is movable and is moved upwards to close the eye. They also have nictitating membrane, a thrid eyelid which is semi-transparent. The nictitating membrane can close across the eye when eyelids are open, and protect their eyes.
Snakes do not have eyelids. They have speical scales called "spectables" to protect their eyes.
2. The carapce or shell of a turtle is modified exoskeleton. It is modified skeletal elements of ribs, parts of pelvis, and vertebrae. It consists mainly of costal and neural bony plates.
The ventral surface of the shellis called the plastron, whereas the dorasl surface is called Carapace. The plastron is made of skeletal elements that occur in pairs. The anterior ones are called epiplastra, whereas the posterior ones are hypoplastra. The ones in the middle are entoplastrom. The bony elements are covered by keratinized structures called scutes.
The dorsal part of the shell is Carapace which consists of ossified ribs. The ribs are fused with dernal bone, to dermal plates beneath the skin, forming a hard structure. The scutes are the keratinized layers that cover the skin and protect the shell from injuries.
3. Hawks have hooked beaks. The hooked beaks help them rip the flesh of their prey. The feet have sharp talons which can be used to dig into their prey to kill them. The sharp and curved talons help them grab on to the prey, to tree branches and rocks, and help them to balance.
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