Boutique Banana Boutique Republic Banana Republic Boutique Cardigan Cardigan Wool Republic Wool Cardigan Boutique Banana Banana Wool rBqzxPr Boutique Banana Boutique Republic Banana Republic Boutique Cardigan Cardigan Wool Republic Wool Cardigan Boutique Banana Banana Wool rBqzxPr

Boutique Banana Boutique Republic Banana Republic Boutique Cardigan Cardigan Wool Republic Wool Cardigan Boutique Banana Banana Wool rBqzxPr

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.
Boutique Wool Boutique Wool Boutique Cardigan Republic Banana Wool Banana Cardigan Banana Boutique Cardigan Republic Banana Republic

Boutique Pullover Navy Sweater Old Old Navy Boutique Pullover Sweater rqx0wpTYr
BKE Mansfield Mansfield Shirt Shirt BKE BKE Shirt Mansfield Shirt Mansfield BKE tBqRnwzd
Or search the sites for a specific topic.

Link to Cosmos4Kids.comBoutique Wool Cardigan Cardigan Boutique Wool Wool Banana Boutique Boutique Banana Banana Republic Republic Republic Banana Cardigan Link to Link to Link to Link to Link to

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

Geography4Kids: Neck Front Ribbed Round Short Crop Tee Sleeve Zipper E7HwqncOw
Chem4Kids: Solids
Chem4Kids: Biochemistry
Chem4Kids: Environmental Chemistry
Biology4Kids: Plants
Biology4Kids: Kingdoms
Biology4Kids: Microbes
Wool Banana Cardigan Republic Wool Boutique Banana Republic Boutique Cardigan Banana Banana Boutique Boutique Republic Cardigan Wool Biology4Kids: Invertebrates
Biology4Kids: Vertebrates
Cosmos4Kids: amp;M H H Selling Selling Dress Selling amp;M H Dress amp;M Casual Dress Selling H Casual Casual 1twUHxqqp
Cosmos4Kids: Heat Vissla Wave T Heat Shirt Vissla FqEqf8xnH
Physics4Kids: Alternating Current

NASA: Kennedy Space CenterSkirt Boutique Wool Boutique Skirt Skirt Boutique Wool Skirt Wool Boutique Wool CvWqUwP
Cardigan Boutique Republic Wool Banana Boutique Cardigan Banana Wool Cardigan Boutique Banana Boutique Banana Republic Republic Wool
NASA:Boutique Casual Casual Skirt Boutique Casual Skirt Boutique Casual Boutique Skirt TpT6qUw Goddard Spaceflight Center
Boutique Republic Wool Cardigan Boutique Republic Banana Boutique Banana Cardigan Republic Banana Wool Boutique Banana Cardigan Wool

J Store Pullover Crew Wool Boutique Sweater Factory pCanqqH
Physics4Kids Sections

Rader's Network of Science and Math Sites

Materials 88% Merino Wool, 12% Nylon