Depends on what you mean by coevolution.
Co-evolution is a cop out god did it type answer.
The ability to sense and react to the surrounding environment.
Light sensitive cells.
Nerve cells
Central Nervous system
Eye pouches
Liquid filled Enclosed Eye pouches
Light reactive "pupil" (this may have formed before the enclosed eye pouches)
Brain
Lens
Differentiated areas of the brain.
This is a canned answer that basically is copy and paste because I have seen it more than once. So I take it a step further since you are implying this is the process.
Was this process actually observed? If so can this observation be provided so that the rest of us can see it? If not then this is an hypothesized answer. It's just like the video I saw on how the eye evolved. All speculation at best. What was more entertaining was how they some how could also say: This is the sight of each stage of the evolution of the eye. The variable the always forget is the vision center of the brain. If it processed sight the same way sense it started processes. Then this would be a feasible and likely conclusion for sight at each stage. But given that the vision center of the brain is evolving also, the processing of sight was probably much worse which left the life form mostly blind during the whole evolution process of the eye evolving.
Blood, then blood vessels that functioned to move the blood, then a specialized blood vessel that function as a central pump. Why?...same as above.
So evolution is as easy as baking a pie? Poof there it is?
Your reference does not seem to state that the heart hurts when we lose someone near to us. Your chest hurts when under stress because that is an muscular reaction to anxiety. Unless you can show some medical reasearch that indicates the heart is directly connected to our emotions, I am inclined to believe that this is not so. Your whole body reacts to stress...in some situations people lose control of their bladder or rectum. I would not say that this means the bladder or rectum are directly attached to our emotions.
Oh,I forgot. All creationist lie unless an evolutionist confirms it. Most be why science only employs people who believe in their main theory. And fire anyone who may disagree.
Your question makes no sense because jellyfish have no heart and do just fine. Sponges have no heart and also seem to survive.
Nice dodge. The wuestion has nothing to do with life forms being able to survive without a heart. It has to do with the heart being able to function properly on the exact day it is needed to sustain life. There are to many variables to the heart to say that it can.
Short answer: Because the babies that didn't have that ability never grew up to make babies of their own. The real source of the answer to this lies in the parts of the animal kingdom that are closely related to our common ancestors (in evolutionary theory). Do those animals have the same capabilities or limited amounts of those capabilities?
Using your logic here. The gene that causes this should have already been eliminated, because all babies before the sugery existed to save them would have died. Keeping that gene from being passed on. But that is not what we see now is it?
And I noticed that you skipped the part about the babies heart working as a parallel pump. I guess you did not have an answer to that one.
Why do you think that seeing where something has been gives us the ability to tell where it is going to be? Also, this question implies that evolution has a "goal" or a direction. In reality, at this point in time, every extant organism is at the "peak" of the evolutionary tree. They're the ones that made it...the rest weren't "evolved" enough to make it. If the environment had been a little different at the right point in the past, then we might very well have big cats making cars instead of primates.
That does not even work, and you know it. Evolution had nothing to do whether a life form could survive a meteor impact. Because if all of a certain type were to close to impact, they died and became extinct for another reason that has nothing to do with evolution. So your broad answer here does not work.
