Debate and discussion of any biological questions not pertaining to a particular topic.
Why the animal just born know how to walk or swim?? But human baby just born, know nothing but cry for interact with other. For animal, they need a few months to learn their living skill but for human needs years.. Undeniedable than human full-grown are more intelligent or in other words human is most intellectual in this earth than other living groups. Why????related to genes, brain capacity or what
Animals have relied on primal instincts for far longer than humans have been using theirs. Also, there are things such as learned or instinctual behaviors as well. A human baby knows what the nipple is for, right? It's an interesting situation
"Take four red capsules, in ten minutes take two more. Help is on the way."
----- Voice from the Medicine Cabinet
You could also be interested to make some research about Neoteny in human. I don't know a lot about it, but basically it goes like:
human babies need to be born before fully formed in order to be able to go through the birth canal. Otherwise the head would be too big and they would be blocked. So an early exit and an extended outer maturation are an advantage, even though it puts a higher educative burden on the parents.
The thing with baby birds is that they can fly a few months after being born, whereas humans take a few years to learn to properly walk.
But, if you think about it they are probably the same in terms of ratio to average life span. As humans live a lot longer than birds.
The baby of a deer or wolf or other wild animal would have little chance of survival if it wasn't able to walk ever since birth. So evoultion has favoured theis way of giving birth. In apes and humans the parents take care of the child so evolution has favoured the incompletly developed child. For the baby deer, walking is an instinct while a baby human has to learn it. The baby human has some instincts as well(sucking milk is one).
I don't think what you said is enterily true. I mean, if we needed to give birth to completely developed babies then evolution would favour the creation of a wider birth canal. It is simply a consequence of the fact that the baby is born with that size that the canal is so narrow
"As a biologist, I firmly believe that when you're dead, you're dead. Except for what you live behind in history. That's the only afterlife" - J. Craig Venter
As suckling milk is an instinct for human baby, so as the baby deer. Most of the mammals also know how suck milk(e.g tiger, lion, elephant, ape and other) But most of them just born know how to walk, and other. Do you think is just instinct?(i just want to more, no offend) And for evolution, i'm argee with u.
i heard before that the ratio of life span for the human and other animals but is there any proof for that. For me, this idea a bit confuse. I argee with chris4. As the animal just take few months and the human baby needs 21 years to full grown( maybe other need more, hehe)
Well, I am not sure of this info anyway, and I have too few time to make an extensive search about it. Anyway, whatever the thruth on the neotenic theory,your reply is not necessarily true. Indeed selection may nhas to tinker with what she can act on.
I would see this:
If a bigger brain significantly increase the fitness of the species, anything that would favor this trait would increase the fitness, and would be selected for. But a limit is the size of the brain at birth, OK?
What are the solution:
1- remodel the birth canal of the mother
2- limit brain size
3- Give birth earlier when skull bones are not completely sealed.
1- Need to extensively change the hips and/or position of the genito-urinary tract. This probably involve to change many developmental parameters, hence a real lot of random (or intelligent design). But we can probably rule this choice out, only because the human hip are definitely not ideal for the bipedal position, and improvement in this zone could definitely increase fitness, but still ther is a lot of room for improvement since our ancester stood up. This is probably something not very easy to randomly tinker with... And in my opinion a slap in the face of the inteligent design, which strangely led to so many "stupid designs". Very stupid design when my back hurts some days
2- A way probably followed by some of our distant cousins...
3- Premature child are often found, not much tinkering involved: any genetic trait that would lead to "not to" premature birth would hitchhike with the selection for the bigger brain and be selected for.
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