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A population is a group of organisms that are all the same species. That's it. You're done. A group of ducks would not be a population if there were mallard and wood ducks combined. Scientists would say that there are two populations existing in the same area.

Population biologists study groups in a specific area. For example, among political regions there are a U.S. population and a Mexico population. Life for these groups is totally different in many ways. We also said a population is all the same species. When you look at the U.S. and Mexico, you might be looking at human populations or dog populations. They all interact, but they are different populations.
You need to remember that populations don't just sit there. Things are always happening. Organisms are born and the population size increases. Other factors that will increase the size of a population are good weather, medicine, geographic isolation and no predators. Organisms will also die of old age and the population will decrease. Populations can also decrease when there are more predators around, after a natural disaster, when competition is too great, or when some of the organisms just leave the area ( migration).
No matter how well a population succeeds in its area, it is still limited even if no outside forces are applied. Three main factors limit population expansion. There are others, but htese are some biggies.

There are physical limits. Sometimes other environments are just bad places to live. They may be too hot, too cold, or too dangerous.

Next are the competition limits. You might have a great place to live but there may be other organisms competing for your food. If there is a smarter bird in the next area, you might not be able to get all of the food you need. A worse situation would be to meet a bird that wants to eat you.

Last are the geographic limits. If you are a mouse living in a valley and there are mountains in every direction, are you going to leave your area? Probably not. You live a good life and might die if you tried to get over the mountains. An ocean might be another geographic limitation.
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  • Style TES3529/Sku 418298
  • Graphic t-shirt
  • Sleeve hit
  • "Rock Revival" patch
  • Model Info: Height: 6'5" | Chest: 37" | Waist: 32" | Hip: 42" | Wearing Size: Large
  • EXCHANGES ONLY, NO RETURNS OR FREE ALTERATIONS. Factory Seconds are the same quality fabric as our other styles, but may have flaws that do not pass our inspection. Flaws may include, fit/wash variance, fabric runs/slubs, excessive grinding or holes, etc.
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  • 100% Cotton.
  • Machine wash cold inside out with like colors. Do not bleach. Tumble dry low. Do not iron.
  • This quality denim is hand-finished for a unique look. It will wear like your favorite jeans, with each hole and tear continuing to destruct over time. You will love the comfort of this denim that has the look and feel of years of wear.
  • Swimwear and Under Garment Return Policy: Garment can only be returned in new condition, not worn or washed, with original tags attached, within 30 days of purchase along with a purchase receipt.
  • Due to the nature of leather/suede, small variances of color in the skin may occur, this is in no way considered a defect. These are inherent characteristics of leather/suede and will enhance the individual look of your garment.
  • Adjust-O-Matic links allow you to remove or add a link by lifting a center tab on the last link. If you need help, your local Buckle store can help you at no charge. Or, a jewelry store can assist you for a minimal charge.
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  • Swimwear and Under Garment Return Policy: Garment can only be returned in new condition, not worn or washed, with original tags attached, within 30 days of purchase along with a purchase receipt.
  • This quality denim is hand-finished for a unique look. It will wear like your favorite jeans, with each abrasion continuing to wear over time. You will love the comfort of this denim that has the look and feel of years of wear.
  • Swimwear and Under Garment Return Policy: Garment can only be returned in new condition, not worn or washed, with original tags attached, within 30 days of purchase along with a purchase receipt.
  • This fabric has been created using a burnout process. Wash before wearing as color can rub off on to other fabrics.
  • This quality garment has been hand finished for a unique, individual look. Each abrasion, hole and tear will continue to destruct over time. We hope you love the vintage appearance and comfort.
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