It's like how evolutionists can't answer, "How did pregnancy evolve?" Pregnancy is either all or nothing. You can't have a 3 month pregnancy, then the next stage a 4 month pregnancy. It's all or nothing. Seems very unlikely pregnancy evolved gradually step by step.
Is this supposed to be a satire, with you mocking the creationists? Most creationists I know are smart enough and educated enough not to make up arguments that are this stupid and ignorant. This is a spoof, right?
No, it is not a spoof. I have asked this question many times and I am always met with radio silence. Pregnancy can not evolve step by step. Think of all the stuff you need for pregnancy inside the woman's body over 9 months. How did they evolve step by step?
It could be that I am ignorant of the subject and the answer is obvious. But, I have yet to see any evolutionist, even Dick Dawkins, explain how pregnancy evolved or came to be in the first place.
Where have you looked? What books and papers have you read? This is such a vast, open-ended question, that it is difficult to describe in an internet post, especially to someone who apparently lacks a high-school education in biology, and doesn't have a rudimentary grasp of how evolution works. But I will give you a hint; the answer to your question lies in what you wrote, namely the words "step-by-step".
The complex life-forms you see on the planet did not just appear one day, for that would truly be a miracle (which is what you believe happened). They are the descendants of a very long line of ancestors that can trace their origin to the very first self-replicating chemicals that first appeared on Earth over 3.5 billion years ago. For most of life's history, organisms were simple, single celled, with cells occasionally coming together to form larger structures like sponges, bound together by collagen (the sticky tape of the animal kingdom). Some of the earliest fossils we have for true multi-cellular life forms that could build large bodies are about 600 million years old. Charnia, for example, the fossils of which have been found at several sites around the globe, used simple, fractal patterns to build their bodies, and it took about
6 instructions to accomplish this. Very simple, very primitive, and old enough that it was neither a plant nor an animal, but something older still. Then about 550 to 500 million years ago, there was an explosion of life on this planet, driven by multiple factors. And the primary families of living things we find on the planet today all began their journey during this period. One of the factors was sexual reproduction, where new organisms were formed through the fusion of male and female gametes, each carrying part of the organism's genome. Sexual reproduction allowed genes to be shuffled much more efficiently, which in turn allowed nature to experiment with different forms, and optimize the results to suit the environments in which the organisms lived. An example of this diversity would be the group known as the trilobites. Scientists have discovered literally thousands of different species of trilobites, all over the globe.
About 400 million years ago, certain types of fish that lived and hunted food in shallow, marshy waters evolved fins with stiffer bones that allowed the fish to walk. Imagine that, a fish that could do push-ups! And we have found fossils that show us how this evolution happened, from Tiktaalik to acanthostega. To this day, mammals use the same arrangements of bones in their fore and hind limbs that we first see in these fish. Including the whales, which were mammals that moved back to the water, that display this same arrangement in their limbs (did you know that whales still retain rudimentary pelvic joints, just like their land-dwelling relatives?).
Animals had begun to colonize dry land, which required new challenges to be overcome. Namely, moving from eggs that were laid in water, and required water to survive, to mammals where the egg develops within the body of the mother. Along the way we find amphibians, which live on land, but still need water to lay their eggs. To reptiles and birds, which began to enclose their eggs in hard shells, an embryo along with the food the embryo needs to grow, to keep the egg from drying out. To mammals which give birth to live young. We can still see all these different solutions that nature came up with to solve the problem of keeping eggs alive, the solutions that allowed our ancestors to conquer the land, and the air.
Modern human dna is made up of over 3 billion nucleotides, which include hundreds of thousands of nucleotide sequences, which we call genes, that build proteins and regulate how these proteins are used to build structures within our bodies. This did not happen overnight - it is, in fact, the product of billions of years of trial and error, completely undirected, with no goal or purpose. Starting from the earliest life, using just 2 or 3 instructions, this is where we end up.
This stuff is fascinating. You should pick up a textbook on evolution to learn the basics, and then start focusing more closely on the question you asked - how did mammals develop the ability to carry their embryos inside their bodies, and why different animals have slightly different ways to get to the same goal. I promise you that the journey will reward you much more than you can imagine right now.
