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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. - CBSE Class 10 - Science

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Question

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?

Solution

X are trilobites, Y are ammonites and Z are dinosaurs.

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 Lakhmir Singh Solution for Biology for Class 10 (2018 to Current)
Chapter 4: Heredity and Evolution
Q: 65 | Page no. 211
Solution 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. Concept: Evolution and Classification - Fossils.
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