i)The death and disappearance of large groups of plants and animals over a short span of time is called mass extinction
ii) Solar nebular theory given by Kent in 1755 and by Laplace in 1796
Both are correct
Both are incorrect
(i) correct (ii) Incorrect
(i) Incorrect (ii) correct
Mass Extinction -
Death and dissappearance (extinction) of large groups of plants and animals over a short span of time is called mass extinction
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Correct option is 1