Look at this picture of some embryos:
One of them is a human, do you know which?
How about this one:
Lets make it really easy for you:
Do you know it now?
Even if you do I’ll give out the list of species from left to right:
Turtle – Hen – Ostrich – Dog – Bat – Rabbit – Human.
What I’m trying to show you is that the earlier back you go through embryology, the harder it is to distinguish between animals. That is because we all come from the same origin, and I don’t just mean one egg and one sperm. I mean we all come from the same origin evolutionarily.
You can kind of see how as well. In embryology we all start out as a sort of tadpole, with a long tail, no arms or legs, and our eyes on the sides of our heads. As the embryo develops the tail starts to shrink or become more defined. Arms and legs start to appear as well as other obvious facial and bodily features. We would look something similar to a very odd and primitive amphibian. Finally, depending on what animal you are, you would start to take on the appearance of your true species.
Embryology is almost a documentation of evolution right before our eyes, albeit a rough one.
Evolution has developed all of us from a single cell to what we are now. This means that every animal on the planet is related to each other through that original one cell. This is provable.
Think about paternity testing. When you want to find out if a child is yours you give samples of your’s and the child’s DNA. Scientists then check for similarities and can therefore say whether or not you are the parent. The difference in DNA between each person is a fraction of a percent. So they check for that fraction.
It’s the same principle for seeing how related we are to other animals. Scientists took samples of DNA from all of the animals they could compare. When the results came back, a lot of people were surprised (as they always seem to be in Science).
What they found was that there is barely more of a difference between us and other animals than there is between us and our parents. Apparently it takes very little change to turn a turtle into a human.
In the end we are all just one big family. And Embryology shows us how close that is to the truth.
Does this mean we should reconsider animal rights?