For a long time it was also believed that life came out of decaying and rotting matter like straw, mud, etc.
According to theory of abiogenesis, life originates from non-living.
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Reason : Allergens in the environment on reaching human body stimulate mast cells in certain individuals.
$I.$ Ladybirds and dragonflies are used to get rid of aphids and mosquitoes
$II.$ The bacteria Bacillus thuringiensis $(B t)$ are used to control butterfly caterpillars
$III.$ Trichoderma sp. free living fungi, are present in root ecosystems where they act against several plant pathogens
$IV.$ Rhizobium is a symbiotic bacterium that lives in the stem of legumes
Which of the statements given above are correct?
$(I)$ Gene flow ;
$(II)$ Genetic drift
$(III)$ Mutation
$(IV)$ Genetic recombination
$(V)$ Natural selection
The correct combination is