Questions

In biology, Homology is defined as any characteristic of biological organisms that is derived from a common ancestor. 

Hence, Homology is evidence of Common ancestry.

Since, the sentence starts talking about the reason; R will be the continuing statement as it goes with the flow of the statement. The continuing statement talks about the existing of life i.e. P. Thus, all other options are eliminated. The correct formation would be, ‘There is no reason why we should not be willing to think that life may exist in great profusion in other worlds.’

Humming bird is the smallest bird and the only bird which can fly in backwards in the world.

Fragmentation occurs in a dynamic memory allocation system when many of the free blocks are too small to satisfy any request.

You can divide the frequency of a clock by just implementing T Flip flop.

Give clock as clock input and tie the T input to logic 1.

India is the 2nd largest importer of weapons in the world, as per 'Trends in International Arms Transfers 2018.

Humidity means the amount of watervapour present in the atmosphere. It depends on weather, location and temperature of the place.