A) The fossil of layer X must be more complex than that of layer Y
B) Modern forms of life may have evolved from earlier forms of life
C) The fossil of layer Y was formed before the fossil of layer X
D) Vertebrate fossils are found only in sediments.
Correct Answer: B
Solution :
Fossils are the remains or impressions of the dead animals and plants that lived in the remote past. In the ocean, fossils are settled at the bottom in the soil/sand layer by layer. In the course of time, these layers changed into rocks due to the presence of the water above and also due to chemical reactions. The distribution of fossils indicates that early fossils present in the bottom layer are simple, however, the recent fossils found in the upper layers are more complex. Thus, the fossil of layer Y will be more complex than that of layer X. Also, the fossil of layer X was formed before the fossil of layer Y. As the modern animals are more complex than the earlier animals', thus, modern forms of life may have evolved from earlier forms of life.
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