If you want to accept the idea of evolution, you must also accept the idea that evolution takes millions and millions of years. If you accept the age of the world I won't go through on proving the age of fossil remains and bones all over again and jump right into your question. You also did not raise any questions on DNA so I assume you accept the existence of DNA and that primates are in fact our closest relatives.

Now, if you had bothered to check the links in my previous post (so that you know I'm not just making this up and pulling it out of my ass), DNA is the building blocks of life. But what is DNA? DNA is often likened to a set of blueprints. But what is the DNA itself made of, what is the "ink and paper" of the blueprint? The answer is chromosome. Again, with a powerful enough microscope, you can see and detect chromosome. Humans have 23 total pairs of chromosome: 22 to determine how you're going to grow and information on your blood, organs, bones, skins etc; and the last pair is to determine your sex.

Now your question is: how do scientists figure out what chromosome does what? The answer is The Human Genome Project, a worldwide project involving hundreds of scientists across the world and thousands of man-hours that started in 1990. One of the methods used was isolating hereditary and rare diseases like the kid with hairs all over his face and entire body, to see which chromosome was activated in him and not in a healthy family member.

OK, now you get the idea we now know what are inside our DNA (the Human Genome Project was completed in 2003, but there are still some studies on the more obscure combinations). Because evolution is such a hot topic, it is natural that primates are also top in our list to check, thus the Chimpanzee Genome Project.

The result is amazing: a full 1/3 of our Chromosomes are of the same makeups as a chimpanzee, more than any other creature. Furthermore, the primates have 24 pairs of chromosome. That means humans are missing one pair of chromosomes that would make us more ape-like. This is called Chromosome 2 in genetics. Not only did we find that we're lacking this pair of chromosomes, we actually found remains of it in our DNA.

So yes, when scientists say chimpanzees are our closest human relatives, they are not making fairy tales up.

The Origin of Life is tied to the earth. Once we have determined the methods to measure the age of the world, the branch of science known as geology can then tell us what the world was like millions of years ago. In addition to fossils, a history of life can then be determined.

One of the theories on how life started on earth was the primordial soup. The theory suggests that certain conditions on earth sparked the creation of amino acid. Amino acids are like numbers and letters, combination of them makes different kinds of protein that make up cells.

Ok, so what is that "spark"? The theory states under "certain conditions on earth". Based on geological evidence, scientists can determine what the earth was like. The Miller-Urey Experiment was a test: if we replicated the conditions on earth, can amino acids be created? The answer is yes, and it is not a fluke because like all science theories; it has to be vigorously tested and retested. So yes, if you can afford the equipment and time; you too can create amino acids in your house.

I wish to add that this theory is accepted because it is one of the best possible scenarios that can be proven by an experiment. The acceptance of this theory does not mean life is not created by other methods. For all we know some aliens passing by decided to pee in the ocean.