Amitash

Environmental science is multi-disciplinary and it hovers between physical science and biological science. You can study the environment from a biologist's point of view as well as a physicist's point of view. Most universities (IMHO) would consider it to be a biology module. So picking it would not "jeopardize" your career

You are probably missing something.. The first life that emerged were simple cells that were able to metabolize. This could have happened by chance because there was an ocean of chemical reactions on the earth then. With numerous reactions taking place simultaneously, it is not unbelievable that some reactions actually gave rise to the first cell. Then we all descended from them.

Let the military scientists conduct their research, then we will find out whether he really did not consume anything for so many decades.

It could be a mechanical bug!

If anyone knew what was there before a big bang, he will receive the Nobel prize.

As Mitochondria are the energy currency of the cell, they are definitely related to the ageing process of the living things. Mitochondria are organelles which have their own DNA. Mutations in the DNA of the mitochondria might be responsible for the loss in vigour. SO they are basically, a prokaryotic cell within a eukaryotic cell. They divide like a cell and are equally distributed to the daughter cells. So if a mutated mitochondria is passed to the daughter cells, it should not be a surprise.