Dinosaurs are :[BHU 83]a)Primitive amphiniansb)Extinct reptiles c)Giant mammalsd)Primitive mammalsCorrect answer is option 'B'. Can you explain this answer?

Question

Answer

Dinosaurs went extinct about 65 million years ago (at the end of the Cretaceous Period), after living on Earth for about 165 million years.

Answer

S , b)only

they're once in a time lived but now not

Answer

Dinosaurs are archosaurs, a larger group of reptiles that first appeared about 251 million years ago, near the start of the Triassic Period. Some other non-dinosaur reptiles are also archosaurs, including pterosaurs (the now-extinct flying reptiles) and modern crocodiles and their ancestors.

Answer

Dinosaurs are extinct reptiles

Dinosaurs are a group of reptiles that existed millions of years ago. They are classified as extinct because there are no living dinosaurs today. The correct answer to the question is option 'B' - Extinct reptiles.

Explanation:

1. Definition of Dinosaurs:
- Dinosaurs were a diverse group of reptiles that lived during the Mesozoic Era, which lasted from about 252 million years ago to 66 million years ago.
- They were the dominant terrestrial vertebrates for over 160 million years.

2. Characteristics of Dinosaurs:
- Dinosaurs were characterized by a number of unique features that distinguished them from other reptiles and animals.
- They had upright stance, with legs positioned directly beneath the body, which allowed for efficient walking and running.
- Most dinosaurs were bipedal, meaning they walked on two legs, although some were quadrupedal, walking on four legs.
- They had a variety of body sizes, ranging from small, bird-like dinosaurs to massive, long-necked sauropods.
- Dinosaurs had diverse diets, with some being herbivorous, others carnivorous, and some even omnivorous.

3. Extinction of Dinosaurs:
- The dinosaurs went extinct at the end of the Cretaceous Period, about 66 million years ago.
- The most widely accepted theory for their extinction is the impact of a large asteroid or comet, which caused a global catastrophe.
- This event led to widespread environmental changes, including wildfires, acid rain, and a decrease in sunlight, which disrupted the food chain and led to the extinction of many species, including the dinosaurs.

Conclusion:
Dinosaurs are classified as extinct reptiles because they were a diverse group of reptiles that lived millions of years ago and are no longer present today. They had unique features and characteristics that set them apart from other reptiles and animals. The extinction of dinosaurs is believed to have been caused by a catastrophic event, such as an asteroid impact, which led to widespread environmental changes and the demise of these ancient reptiles.

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