Science

Before Monkeys: our Grandad, the fish

All of you surely know that humans have evolved from apes.  But the line of evolution isn’t so simple, just think that ALL life evolved from a little unicellular bacterium.

What happened before the monkeys? The first creatures that appeared on the earth, are of course sea-creatures: fishes, crustaceans and many many others! Although fishes were not the first to leave the marine environment, they were the first that EVOLVED in the sense that they changed their internal structure and their organisms adapted to the terrestrial environment. And so fins and gills disappeared, while lung-like organs appeared: amphibians were born. They gradually “enjoyed” the earth and conquered our planet: that was the age of reptiles. Among reptiles, dinosaurs surely were the rulers, but not the only forms of life.

In fact from reptiles came three branches: today’s reptiles, dinosaurs that evolved into birds, and incredibly mammal-like creatures.

All of this happened only in about 4oo or 500 million years, fancy that!

This terrific (according to me) video can give you an idea of what I’ve tried to explain until now.

It seems almost impossible, it’s difficult to realize that I’m the descendant of a fish, looking at my body structure. But our dear marine ancestors have left us an inheritance.

It is something that “you see everyday in your mirror, so you probably never think about it” says Dr. Michael Mosley. It is the Phyltrum, a sort of scar that connects your nose to your lips, and it is apparently unuseful.  Observing the development of a human embryo (very similar to that of any mammal) we can note that it is formed by three parts that slowly come together to form the human face.

The most evident clue of our marine origin is the fact that our eyes, at the beginning of their development, are situated on the sides of our head, and then move to the centre. Our lips start out as gill-like structures in the top of our heads and then move down: the phyltrum then connects them to the nose.

We can moreover find evidences of this in our gonads structure, and also in the hiccup! ..

For more information about the topic and to watch the video of the development of the human embryo, click on the link below!

http://www.bbc.co.uk/news/health-13278255

Ryder

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