NOW COMING TO OUR FIRST QUESTION? HOW LIFE ORIGINATED ON EARTH?
Six major theories are proposed to explain the origin of life on earth. These theories are as follows:
1. Theory of Special Creations: The theory of special creation is proposed that life on earth is created by a supernatural power, the GOD. According to the Christian belief, god has created the universe, planet, animal,plant and human in six natural days. Similar beliefs are also been proposed by other religion as well. There are believes in the theory of special creation. These points are as follows:

A. All living organisms were created same day [NO DIFFERENCE IN THEIR APPEARANCE].
B. They were created in the present form [NO EVOLUTION].
C. Their bodies and organs are fully developed to meet the requirement to run the life [NO ADAPTATION]

OBJECTIONS TO THE THEORY OF SPECIAL CREATION:

• It was purely based on religious belief.
• There was no experimental evidences to support the assumptions.
• The age of different fossils proves that living organism appear on earth in different time frame.

2. Theory of spontaneous generations: The theory of spontaneous generation or abiogenesis assumes that non-living material in a spontaneous manner give rise to life. There are several observations supporting this theory, which are as follows:

• Hair of horse tail dipped in the water gives rise to horsehair worm, gordius.  
• Fly larvae develops on rotten meat.
• In ancient Egypt, it was believe that frog, snake, crocodiles in the mud of nile river warmed with sun.

Van Helmont claimed that he can produce mice from the dirty shirt and hadful of wheat grains kept in dark cupboard in 3 weeks.