if we are continually evolving did we start of with 1 eye how many will we end with?

Answer 1

Evolution is an adaptive response to changes in the environment.It does not result in addition of organs to species except when mutations do occur but these are rare and usaully not in favour of the organism.You will definitly end up with two eye but better at seing if you are a man and any deviation is abnormal.

Answer 2

Actually, vertebrates started off with three eyes.

The remnants of this third photoreceptor can be seen easily in some of the primitive fishes, such as lampreys, as well as some reptiles (including iguanas and the tuatara).

In mammals, the third eye has evolved to become part of our nervous system, incorporated into the hypothalamus, and is closely tied to the release of hormones that vary by timing in the day cycle, or even seasonally - still functioning somewhat in light sensitivity. Stimulation or lack of stimulation of this third eye is related to such things as Seasonal Affective Disorder.

So, currently the natural selection pressures have favoured the development of two eyes as visual organs in humans. If selection pressures changed in the future, that could change as well. If we switched to living in total darkness, perhaps we'd end up with no eyes.

One eye seems not to be a very useful set-up though. There aren't any critters alive with only one eye. It would seem that if you're going to go through the metabolic cost of making an eye, you may as well make enough to cover your entire field of view.

Answer 3

It doesn't work like that. We have two of many things - eyes, ears, nostrils, arms, hands - because of something called bilateral symmetry, which means that things develop on both sides at once. So no, we never had only one eye, and we'll never evolve any more eyes.

Answer 4

we could evolve a third eye in a million years or so from now , but only if we needed one...... we dont need one and for what purpose ?

Answer 5

I'd recommend understanding the bare basics of evolution before asking a question like this.

Answer 6

No. We'd only get more eyes if there was a biological advantage to getting more and we prevented people with only two from breeding.

Answer 7

You clearly misunderstand the mechanism of evolution. You are either under-educated, or under-capable. Read a book.
Two eyes offer advantage to a mammal...three, not so much...

Answer 8

We started with light sensitive cells.

We will probably always have two eyes. We are mammals.

Answer 9

two plus your japs eye

Answer 10

personally no more than what you have now