Answer
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Hint: The occipital condyle or OC is a unique bony structure that connects the cranium and the vertebral column or spinal cord of reptiles, birds, and mammals. The presence of an OC helps to move the head 3600 and the presence of two OC helps to move the head 1800. Reptiles can move their head in 3600.
Complete answer: Occipital condyle is a rounded knob-like structure that is present at the base of the skull which articulates with the first vertebra. It helps animals to move their heads.
Reptiles have only one occipital condyle.
Humans have two occipital condyles.
Additional information: The class reptilian refers to the animals that creep or crawl in the soil for their locomotion. The word reptilia comes from the Latin word repere or reptum meaning to creep or crawl. Snakes, lizards are the most common examples of this class.
Characteristics and features of class reptilian
1. They are mostly terrestrial animals.
2. The body of these animals is covered by dry and cornified skin, epidermal scales, or scutes.
3. They lack external ear openings, instead, Tympanum represents the ear.
4. Two pairs of limbs are present when present (exception: snake).
5. The heart is usually three-chambered, with two atria and one half divided ventricles. But the four-chambered heart is seen in crocodiles.
6. Reptiles are poikilothermic animals.
7. Skin cast is the discarded body scales of snakes and lizards.
8. Sexes are separate and fertilization is internal.
9. They are oviparous animals and development is direct in these animals.
10. Examples include Turtle, Tortoise, Chameleon or Tree lizard, Garden Lizard, Crocodile, Alligator, etc. Hemidactylus reptiles are Wall lizards; some of the reptiles (snakes) are poisonous also, like Naja (Cobra), Krait, Viper.
Thus, the correct answer is option A. one.
Note: No animal has three occipital condyles.
Complete answer: Occipital condyle is a rounded knob-like structure that is present at the base of the skull which articulates with the first vertebra. It helps animals to move their heads.
Reptiles have only one occipital condyle.
Humans have two occipital condyles.
Additional information: The class reptilian refers to the animals that creep or crawl in the soil for their locomotion. The word reptilia comes from the Latin word repere or reptum meaning to creep or crawl. Snakes, lizards are the most common examples of this class.
Characteristics and features of class reptilian
1. They are mostly terrestrial animals.
2. The body of these animals is covered by dry and cornified skin, epidermal scales, or scutes.
3. They lack external ear openings, instead, Tympanum represents the ear.
4. Two pairs of limbs are present when present (exception: snake).
5. The heart is usually three-chambered, with two atria and one half divided ventricles. But the four-chambered heart is seen in crocodiles.
6. Reptiles are poikilothermic animals.
7. Skin cast is the discarded body scales of snakes and lizards.
8. Sexes are separate and fertilization is internal.
9. They are oviparous animals and development is direct in these animals.
10. Examples include Turtle, Tortoise, Chameleon or Tree lizard, Garden Lizard, Crocodile, Alligator, etc. Hemidactylus reptiles are Wall lizards; some of the reptiles (snakes) are poisonous also, like Naja (Cobra), Krait, Viper.
Thus, the correct answer is option A. one.
Note: No animal has three occipital condyles.