If the fossil of an organism is found in the deeper layers of the earth,then we can predict that:

  • A
    the extinction of the organism has occurred recently.
  • B
    the extinction of the organism has occurred thousands of years ago.
  • C
    the fossil position in the layers of the earth is not related to its time of extinction.
  • D
    the time of extinction cannot be determined.

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Explain the following scenarios in a group of organisms,providing reasons for each:
$(a)$ Predators are more in the group.
$(b)$ Organisms survive accidentally.
$(c)$ Organisms are not able to survive in changing environmental conditions.

New species may be formed if
$(i)$ $DNA$ undergoes significant changes in germ cells
$(ii)$ chromosome number changes in the gamete
$(iii)$ there is no change in the genetic material
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An organism which is a worm,has very simple 'eyes',that are really eye spots which detect light. Name that organism.

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