...if science is able to explain about this, it will...

Could somebody please help? Thanks.

If you are discussing a concrete possibility and its consequences, then this is appropriate:

I think if science is able to explain about this, it will also be able to prove the three existences of life as well.

If our family's dog dies, then my mother will be very sad. (There is a real possibility that it will die soon - it is sick and/or very old, maybe).

If you are discussing a hypothetical possibility and its consequences then this is appropriate:

I think if science were able to explain about this, it would also be able to prove the three existences of life as well.

If our family's dog were to die, then my mother would be very sad. (The dog is neither sick nor old; I am merely musing on what would happen, knowing how fond my mother is of the dog).

These begging posts are inappropriate and annoying. They may lose you more answers than they gain. That is not an idle threat. Please do not do it. I believe you have been advised about this before. Patience is a virtue.