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प्रश्न
How fossils formed ?
उत्तर
When a plant or an animal dies, its remains fall on the ground. Over a period of time, its bodies get covered by sediments brought by rivers, winds, etc. These sediments keep on getting accumulated for over hundreds of years and when that land gets eroded, the fossils can be seen clearly. Thus, the process of accumulation of dead remains of plants and animals for over hundreds of years results in the formation of fossils.
संबंधित प्रश्न
What are fossils?
What are fossils ?
Explain the importance of fossils in deciding evolutionary relationships.
What are fossils? Giving one example, explain how fossils provide evidence for evolution.
Some of the important fossils which have been studied are those of organisms X, Y and Z. X were marine arthropods which were common between 400 to 600 million years ago. Y were the invertebrate animals (molluscs) with a flat, coiled, spiral shell which lived in the sea about 180 million years ago. Z are the extinct carnivorous or herbivorous reptiles which appeared on the earth about 250 million years ago and became extinct about 65 million years ago. What are X, Y and Z?
Birds have evolved from reptiles.
Which organism is considered to be the fossil bird?
Why is Archaeopteryx considered to be a connecting link?
How can you determine the age of the fossils?
