ecosystems

• species - organisms that interbreed producing fertile offspring
• population - same species in the same area
• ecosystem - organisms living in an area and the non living components
• habitat - where organisms live
• community - all the organisms in an ecosystem
• niche the organisms role in a community
• interspecific - different species compete for 1 or few resources
• intraspecific - same species competing for all same resources
• food chains show the flow of energy between organisms
• food webs show energy flow through multiple food chains
• energy is lost from heat , movement and undigested waste