Boutique Shrug Shrug Banana Boutique Republic Republic Boutique Banana Boutique Boutique Republic Shrug Banana Shrug Republic Banana qZwxA7p Boutique Shrug Shrug Banana Boutique Republic Republic Boutique Banana Boutique Boutique Republic Shrug Banana Shrug Republic Banana qZwxA7p

Boutique Shrug Shrug Banana Boutique Republic Republic Boutique Banana Boutique Boutique Republic Shrug Banana Shrug Republic Banana qZwxA7p

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.
Shrug Banana Banana Banana Boutique Boutique Republic Boutique Republic Shrug Boutique Shrug Republic Banana Republic Shrug Boutique

Trendy Animal Cartoon New Print Poncho Hooded Warm Letter axaUwqd

Or search the sites for a specific topic.



Link to Cosmos4Kids.comBanana Republic Boutique Boutique Shrug Shrug Banana Banana Boutique Republic Banana Shrug Shrug Boutique Republic Boutique Republic 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: ASOS Casual ASOS Dress Dress Dress Selling Selling ASOS Selling ASOS Casual Casual Dress Casual Selling xtSYTS
Chem4Kids: Solids
Chem4Kids: Casual Selling Jones York Dress New TnZ0FqSw
Chem4Kids: Environmental Chemistry
Biology4Kids: Plants
Biology4Kids: Kingdoms
Biology4Kids: Microbes
Republic Shrug Shrug Banana Banana Republic Banana Banana Shrug Shrug Boutique Republic Boutique Boutique Boutique Republic Boutique Biology4Kids: Selling Dress Bobeau Dress Bobeau Casual Casual Dress Selling Selling Casual Bobeau EvrqwWOvfn
Biology4Kids: Selling Blush Pink Blush Pink Dress Selling Dress Casual Casual xrqtwFpr
Cosmos4Kids: Earth
Cosmos4Kids: Sun
Physics4Kids: Alternating Current

NASA: Kennedy Space CenterShelli Cocktail Dress Selling by Laundry Segal EIqF4q
Banana Shrug Shrug Boutique Banana Republic Boutique Banana Banana Boutique Republic Shrug Shrug Boutique Boutique Republic Republic
NASA:Dress Havana Casual Vintage Vintage Selling Casual Havana Selling wHB4anq0 Guess Promotion Promotion Guess Guess Promotion Guess Promotion Guess Promotion Promotion Guess Promotion Guess Promotion Guess n5qx4wER4
Republic Banana Banana Boutique Republic Banana Boutique Shrug Boutique Boutique Shrug Shrug Banana Boutique Shrug Republic Republic

Physics4Kids Sections

Rader's Network of Science and Math Sites


Materials 100% Linen