All organisms need resources for survival, growth and reproduction; in other words, basic functioning of life. These resources include, food, water, protection from predators, light (or darkness, depending on the species), oxygen (for most of the species), shelter, etc. Most of these are space dependent. For example, even if we, as human beings, need only (say) 1 square feet to stand on, does not mean that's all the space we need. Think about the land...
All organisms need resources for survival, growth and reproduction; in other words, basic functioning of life. These resources include, food, water, protection from predators, light (or darkness, depending on the species), oxygen (for most of the species), shelter, etc. Most of these are space dependent. For example, even if we, as human beings, need only (say) 1 square feet to stand on, does not mean that's all the space we need. Think about the land required for our food to grow on, whether it is grown in agricultural fields or in shelters (animals, which again depend on agricultural fields for food). How about all the fuel that we use and the land it comes from? Think about the space birds or rats need to live in, to protect themselves (and their offsprings) from environment and predators.
A competition for space, causes a competition for resources and thus limits the population of a species. An example is the shifting of animals such as monkeys towards cities (especially in developed countries, such as India), once the forests they live in, are destroyed.
Hope this helps.
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