1 )Dead remains of 2 organisms say a and b were hurries later fossil of only b were found but not of a's. why? 2)when pesticide is sprayed on a population of insects that have grown recently in the house all insects do not get killed .why ?would could be the reasons that led to the survival of some of the insects? 3)how genetic contribution of male and female parents is ensured in progeny?

1 )Dead remains of 2 organisms say a and b were hurries later fossil o

1.	1 )Dead remains of 2 organisms say a and b were hurries later fossil of only b were found but not of a's. why? 2)when pesticide is sprayed on a population of insects that have grown recently in the house all insects do not get killed .why ?would could be the reasons that led to the survival of some of the insects? 3)how genetic contribution of male and female parents is ensured in progeny?
Answer» 1 )Dead remains of 2 organisms say a and b were hurries later fossil of only b were found but not of a's. why? 2)when pesticide is sprayed on a population of insects that have grown recently in the house all insects do not get killed .why ?would could be the reasons that led to the survival of some of the insects? 3)how genetic contribution of male and female parents is ensured in progeny?