{Evolutionist} how did the heart, lungs, brain, blood, veins, kidneys, etc. develop in the first animal?

Question

And how did the animal survive while these changes were occurring? For example, did the first animal develop 10% of complete veins, then 20%, and on up to 100%, with veins throughout its entire body and brain? Then how did the heart slowly develop in the animal and get attached to the veins in the right spot? How did the blood enter the system? The blood could not enter before the veins were complete or it would spill out. Where did the blood come from? Did the blood have red corpuscles, white corpuscles, platelets, and plasma? At what point in this process of development did the heart start beating? Did the animal develop a partial stomach, then a complete stomach? After the stomach was formed, how did the digestive juices enter the stomach? Where did the hydrochloric acid as part of the digestive juices come from? What about its kidney and bladder? The animal better not eat anything prior to this. How did the animal survive during these changes? (And over thousands of years?

Answer 1

You bring up an excellent point here. My question is, how does this occur at the molecular level? Everything about us is encoded in our DNA. How do these changes occur in our DNA to code for such complex organs? I would love to see a molecular evolution of the organ system explained in a plausible, coherent manner. If this were possible, I'd be ready to embrace evolution. Until then, I won't.

Answer 2

These are a Lot of Developements over a Long Period-The Simplest Answer is: By Small Steps, and 3 Billion years of God's work.

When the First Multi-celular Animals Developed, there were no Organs,and Barely the First Differentiated Cells.

Blood is the Easiest-It's Basis is Sea Water(the Ph and mineral contents are still Close). Animals like the Hydra have a Body Cavity, that Water circulates in-This Carrys Food to more Cells, and Wastes away.

The Digestive Tract started the same way, but got Longer-from a Tube, to a More Complex System: More time/chance to absorb Nutrients.. You have the End Product-a Mouth, Stomach, Intestines, Anus-It's really 1 long Passage through the rest of the body.

Knowing That: the Circulatory System was based on the need to more Materials Farther. Simple Cell movements became the Heart (examine an Earthworm verses a Mammal). Originally an Open system(Water from the Environment), there were Advantages to a Closed system(Less Vulnerablity, more Control). Kidneys are Tubes speciallized for Waste Removal,and rather than Leaking Urine, a Bladder could hold waste until removal was convenient.

As Cells speciallized. so could do 1 Job more Efficiently, the Systems they were Attached to got more Speciallized. A Muscle cell Moves(contracts) well, but doesn't Digest food well. Materials are Digested, Moved to the Cell, and Wastes moved away. The Cell can now Move the creature to a new Area.

Yes, Veins were Open at 1 time, the Heart and Stomach were just a more Muscular Tube. Eating was first done as Particles floating in Water-Not Digestion, as we know it.

This is a Fast and Simplistic example, so you might want to get a few Books which can go into more Detail. Look into Simple Organisms, Developemental Embryology, and Pallientology. You have to Examine the Simpler, and Older Creatures to Understand where the Advanced forms come from.

Answer 3

It wasn't called an animal yet. It was a motile multicellular organism. It didn't have blood and heart and veins and other internal organs you're talking about. It absorbed food directly from the environment (heterotroph, and remember the primordial soup?). Then it started to carry food, water and oxygen in groups Then genetic mutations happened, some were advantageous, others were fatal. Some mutations that were advantageous allowed that kind of organism to survive more. As the animal evolved, its body parts' functions became more and more specific, forming organ systems...

Answer 4

You seem to be operating on the assumption that at one point in time "the first animal" sprang into being like Venus from the head of Zeus.

May I suggest that you read "A Brief History of Almost Everything" by Bill Bryson. It's a very clearly written description of scientific thought on the subject you raise.

You may disagree with the science, but you would make much better arguments against it if you understood something of how it works.

Answer 5

* There's no such thing as "evolutionist". Are you a gravitationist, or don't you "believe in" gravity?



Posting a science question in the religion and spirituality section often means the asker does not really want an answer. His goal is to ask a question that he believes proves some scientific knowledge to be wrong, or that science does not yet answer, and make the implicit claim that the only other explanation is a god, and specifically, the same god he happens to believe in.

It's the "god of the gaps" - intellectually bankrupt, since it favors ignorance instead of knowledge, and because of the contained logical fallacy. (And it seems to be argued almost exclusively by christians).

However, on the off chance that you really want to know the answer:

1. This is an example of the argument from incredulity. In fact, several complex organs, which have previously been claimed unevolvable, have plausible means of evolving, including the eye, the bombardier beetle defense mechanism, the woodpecker tongue, and more.

2. Evolutionary mechanisms do account for the evolution of complexity, since non-lethal mutations tend to add more components to simple systems than they remove (Soyer and Bonhoeffer 2006). The abstract of Lenski et al. (2003, 139) is worth quoting in full:

A long-standing challenge to evolutionary theory has been whether it can explain the origin of complex organismal features. We examined this issue using digital organisms -- computer programs that self-replicate, mutate, compete and evolve. Populations of digital organisms often evolved the ability to perform complex logic functions requiring the coordinated execution of many genomic instructions. Complex functions evolved by building on simpler functions that had evolved earlier, provided that these were also selectively favoured. However, no particular intermediate stage was essential for evolving complex functions. The first genotypes able to perform complex functions differed from their non-performing parents by only one or two mutations, but differed from the ancestor by many mutations that were also crucial to the new functions. In some cases, mutations that were deleterious when they appeared served as stepping-stones in the evolution of complex features. These findings show how complex functions can originate by random mutation and natural selection.

Links:
National Science Foundation, 2003. Artificial life experiments show how complex functions can evolve. http://www.sciencedaily.com/releases/2003/05/030508075843.htm
References:

1. Lenski, Richard E., Charles Ofria, Robert T. Pennock and Christoph Adami. 2003. The evolutionary origin of complex features Nature 423: 139-144. http://myxo.css.msu.edu/papers/nature2003/ (See also NSF, 2003, above.)
2. Soyer, Orkun S. and Sebastian Bonhoeffer. 2006. Evolution of complexity in signaling pathways. Proceedings of the National Academy of Science USA 103: 16337-16342.

In addition: "the first animal" had a single cell - it had none of those organs.

Answer 6

If you take into account the complete earth ice ages and stuff.....take 1 billion years.........

I personally believe in god and adam and eve........but i don't have a problem with evolution and adam was given a "soul".

Its hard to image what 1 billion years actually is. I mean take into account 2 thousand years. You might have seen the family guy episode where they made fun of jesus......he was a midget.....but thats sooo true....in 2 thousand years we as humans have grown taller.....ok so thats same species changing...but still thats 2 thousands years...and we're talking about billions of years.

You gotta realize that bacteria and other "living" things are simlar to us...they have dna.....

i do'nt really know where to start on this

but you know how people say we need to eat for "energy"
we literally do.....we eat food and the chemicals break down in us and release energy......that is chemical bonds break and new bonds form...and the net chagne is an increase in energy.......

All we are .....are biological factories.....and thats what all more simple organisms are too. We take stuff in..process it..and make a profit....in our case profit is energy, which leads to us living.

This can happen.....from a single cell orgamisn to a multi cellular ogranism that hass all the organs we have....i mean take only a few million years back

We had larger stomaches....and we could eat plants and break them down.....but some of our ancestors got into a situation where they really couldn't find plants....and what they ate was the left overs of dead animals. Its a lot more energy efficient to break down meat than plants...cellulose walls...almost nothing on this planet can break that down except certain fungus.

I mean have you noticed when you eat corn...you poop out corn. Anyways...you can breka tha stuff down if you chew it up well...but still it takes a lot of energy. If you only ate cucumbers you'd loose weight cuz it takes more energy to process it than you get out of it....

but thats our shift.....we started eating meat and it takes less energy......gave us more energy to developed a brain that needs energy. The people that ate meat had a higher brain function and could survive....the ones that didn't ended up getting caugth by predators......and that itself is on a million year scale.....


we are talking about billions of years.

Answer 7

Illiteracy is a dangerous thing. Based on the tremendous volume of ignorance reflected by the framing of your question you currently aren't qualified to understand the answers we can give you.

Several people have given you the answers you seek here. That is assuming you actually want answers to your questions.

Once again a horse has been led to the water, now, Will it drink?

That is the question.

Go to school, study and work hard it.

Oh and question every single thing that you are told and never stop.

Answer 8

how do fish survive,as they have all the above ?except they
have gills and can filter the oxygen from the liquid they all
swim in.Have a look at a fetus while it is evolving inside of a females womb,and you will have answered your own Question ??? If you are not sure ask your Bible .hahahaha
joking !

Answer 9

If you wanted an answer you'd read something, or at least ask in the biology category. Suffice to say there is no aspect of your question that hasn't been thought of and investigated before. All the literature's out there if you can be bothered finding it.

Answer 10

Just think in terms of billions rather than thousands of years and then you might begin to understand it was a process of survival.( a very slow process )

Answer 11

The way you ask this question is a logic and understanding of a 6 year old. When you are at lest 10, come back and ask again.
Get some education and you'll understand.