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(i) What are fossils? How do we know how...

(i) What are fossils? How do we know how old the fossils are?
(ii) State two differences between homologous and analogous organs.

Text Solution

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(i) Fossils : The remains and / or impressions of organisms that lived in the past.
(a) The fossils that we find close to the surface are more recent than the one we find in deeper layers.
(b) Dating fossils by detecting the ratio of different isotopes of the same element.
(ii) (a) Homologous organs have same basic structural design.
(b) Analogous organs have different basic structural design.
(c) Homologous organs perform different functions. functions.
(d) Analogous organs perform similar functions.
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