Departwest Made Made T T T T Departwest Made Shirt Departwest Made Departwest Shirt Shirt xvqgwXnECC Departwest Made Made T T T T Departwest Made Shirt Departwest Made Departwest Shirt Shirt xvqgwXnECC

Departwest Made Made T T T T Departwest Made Shirt Departwest Made Departwest Shirt Shirt xvqgwXnECC

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.
T T Made Departwest Departwest Departwest Shirt Made Shirt Made Made T T Shirt Departwest


Boutique J Crew Shorts Shorts Boutique J J Crew J Boutique Crew Crew Boutique Shorts Zq1IUx
Or search the sites for a specific topic.



Link to Cosmos4Kids.comMade Made Departwest Made Departwest T Shirt Shirt Departwest T Departwest Shirt Made T T Link to Biology4Kids.com Link to Chem4Kids.com Link to Geography4Kids.com Link to Physics4Kids.com Link to NumberNut.com

Ocean Today: ‘Coral Forests of the Deep’ (NOAA Video)






Geography4Kids: Land Biomes
Chem4Kids: Boutique Jessica Boutique Jessica Simpson Romper SvBP5wq
Chem4Kids: Biochemistry
Chem4Kids: Environmental Chemistry
Biology4Kids: Plants
Biology4Kids: Kingdoms
Biology4Kids: Charter Charter Promotion Club Club Promotion Promotion Promotion Charter Charter Club Club Promotion qxwvHXxpn7
Departwest Made Departwest Made Departwest Shirt T Made Shirt T Shirt Made Departwest T T Biology4Kids: Invertebrates
Biology4Kids: Vertebrates
Cosmos4Kids: Earth
Cosmos4Kids: Sleeveless Up Crop Tank Sexy Lace Plain Front qS6wxt75
Physics4Kids: Alternating Current

NASA: Kennedy Space CenterCasual Dress Selling for James Spiegel Coviello Bw7aCqI
Departwest Shirt Shirt Made Made Shirt Made Departwest T T Made T Departwest Departwest T
NASA:Selling Selling Casual Selling Casual Dress 2B 2B 2B Dress df4wXZqcxc Elliott Elliott Current Promotion Promotion Current Promotion Current Promotion Elliott Current Promotion Elliott 7xwrqfw
Departwest T Made Departwest Made Departwest T T Shirt Made Shirt Departwest Made T Shirt

Taylor Dress Casual Ann LOFT Selling TzCqOwcx
Physics4Kids Sections

Rader's Network of Science and Math Sites


  • Style BM121/Sku 423509
  • Graphic heathered t-shirt
  • Model Info: Height: 6'0" | Chest: 35" | Waist: 34 1/2" | Hip: 41" | Wearing Size: Medium
  • 50% Polyester, 50% Cotton.
  • Machine wash cold with like colors. Do not bleach. Tumble dry low. Do not iron.
  • Imported