Reason of Your Success

Which one is not the reason for the success of Mendel?

The reason for successful establishment on land by seed plants is

Which of the following is not observed in a homologous series? Give reason for your choice.

State whether speed is a scalar or a vector quantity . Give reason for your choice.

Fill in the blank with suitable Article given in bracket. (a/an/the) You are ...... good publisher, I have ..... little doubt regarding your success.