Question

define fossil explain importance of fossils as proof of evolution

Answer 1

Fossils are any imprints or impressions left by some previous organisms in the mud. Subsequently the mud hardened and preserved the body parts of the organisms.

Fossils tell about the organisms that lived long ago. They tell about the structure of some organisms and time period which they lived. The fossils found closer to the surface are more recently than the fossils found in deeper layers. It is seen that organisms becomes more complex in upper layer than in the lower layers. It indicates towards the evolutionary process.

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Answer 2

Answer:

• Any  preserved  remains,  impression,  or trace  of  organisms that  lived  in the past  is called  fossil.  
• Examples include  bones,  shells,  exoskeletons,  stone  imprints  of animals, etc.
• The  time  of  death  of  a  plant  or animal can  be  calculated  by  measuring  the radioactivity  of C14  and  ratio  of  C14  to  C12  (nonradioactive  carbon) present   in  their  body  of  the fossil  organism. By  determining  the  age  fossil.  This called  carbon  dating.
• Once  the  age  of  fossil  been  determined,  it is  easy  to  gather the  information  about  other past  lived  organisms.  
• It  can  be  concluded  that  vertebrates  have  been  slowly  originated from  invertebrates.