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9/4/12 science 7th

key terms science 7th

biosphere the regions of the surface and atmosphere of the Earth (or other planet) where living organisms exist
ecology the study of the interactions that take place amoung and between organisms and the physical features of the enviroment
abiotic factor meaning not alive, are nonliving factors that affect living organisms. Environmental factors such habitat (pond, lake, ocean, desert, mountain) or weather such as temperature, cloud cover, rain, snow, hurricanes, etc. are abiotic factors
biotic factor meaning of or related to life, are living factors. Plants, animals, fungi, protist and bacteria are all biotic or living factors.
population all the living individuals of one species that live in the same area at the same time and compete with each other for food, water,mates and space.
community conssist of groups of populations that interact with each other for food, shelter, and other needs.
ecosystem consist of abiotic community and the factors that affect it.
population density size of a population that occupies an area of limited size
limiting factors any biotic or abiotic factor that restricts the number of individuals
carrying capacity largest number of individuals an enviroment can suport and maintain
symbiosis any close relationship between two or more different species
food chain a simple way of showing how energy in the form of food passes
food web is a series of overlapping food chains
ecological pyramind a transfer of energy
water cycle constant journey of water molecules on earth as they rise into the atmosphere
nitrogen cycle transfer of nitrogen from the atmosphere to plants and back to the atmosphere or directly into plants again
Created by: levis