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Pardon me, but the example of the urban weeds has nothing to do with population density or food. It was about how they adapted to their environment.

Pardon me for observing that plants living in sidewalk cracks will have a different density than plants living in unrestricted areas.

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Why is it difficult for you to believe that organisms would respond appropriately to a lack of food?

You ask the wrong person. Darwin is the one who maintained populations would always increase to the limit of the food supply, and be perpetually on the brink of starvation.

He didn't notice that God has wisely provided means for life to avoid this problem. Different species use different techniques. Some, for example, are territorial. The size of territories prevents overcrowding to the point of starvation.

But I waste my time explaining this to an evolutionist. You'll either claim evolutionism acknowledges these things, and Darwin never said what he said; or you'll look it up and flip-flop.

Here's a hint: Darwin needed populations to expand up to this limit, and although some may slip up and forget why, the need still exists.

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Let me know if you need some definitions of terms.
Thanks, but it seems better to decline.

Maybe you can explain to LinearAQ the difference between an atom and a molecule? Or help out with "replicate". (abiogenesis thread)

Dark Matter + Dark Energy = Dark Truth

"We find that such evidence demonstrates that the ID argument is dependent upon setting a scientifically unreasonable burden of proof for the theory of evolution." - Judge Jones Kitzmiller case
http://www.talkreason.org/articles/Falsify.cfm

"To Compel A Man To Furnish Funds For The Propagation Of Ideas He Disbelieves And Abhors Is Sinful And Tyrannical." - Thomas Jefferson

"And can the liberties of a nation be thought secure when we have removed their only firm basis, a conviction in the minds of the people that these liberties are the gift of God? That they are not to be violated but with his wrath?" - Thomas Jefferson