Living Things & The Environment
Populations
Interactions Among Living Things
Energy Flow in Ecosystems
Cycles of Matter
100
Living organisms interacting with each other and their nonliving environment
What is an ecosystem?
100
The number of deaths and births in a population in a certain amount of time
What are death and birth rate?
100
The struggle between organisms to survive as they attempt to use the same limited resources
What is competition?
100
An organism that makes it's own food
What is a producer?
100
Any form of water that falls from the clouds and reaches Earth's surface; rain, snow, sleet, hail
What is precipitation?
200
Parts of a habitat that are living, or once living; plants, animals, fungi, bacteria, protists
What is biotic?
200
Moving into and out of a population
What are immigration and emigration?
200
A relationship between two organisms in which one organism benefits and the other is unaffected
What is commensalism?
200
An organism that cannot make its own food and must eat another organism
What is a consumer?
200
Most producers take in this gas from the air during food-making or photosynthesis
What is carbon dioxide?
300
A group of organisms that are closely related, who can mate to produce fertile offspring
What is a species?
300
Number of individuals per unit area
What is population density?
300
Any feature an organism has to help it survive in its' environment; camouflage, mimicry
What is an adaptation?
300
A series of single events in which one organism eats another to obtain energy
What is a food chain?
300
Part of the water cycle where excess water runs down and does not sink into the soil and goes into rivers, lakes, and oceans
What is run-off?
400
A group of individuals that belong to the same species and live in the same area
What is a population?
400
The largest number of individuals of a population that an environment can support
What is carrying capacity?
400
A close relationship between two species that benefits at least one of the species
What is symbiosis?
400
A series of overlapping food chains in an ecosystem
What is a food web?
400
The movement of nitrogen from the atmosphere to the soil, to living organisms, and back to the atmosphere
What is the nitrogen cycle?
500
All populations of different organisms living together in a specific area
What is a community?
500
An environment factor (biotic or abiotic) that prevents a population from increasing; food, space, weather
What is a limiting factor?
500
An organism's role (job) within its community
What is niche?
500
Shows the amount of energy that moves from one feeding level to another in a food web. Only 10% is transferred at each level from the bottom up.
What is an energy pyramid?
500
The process of changing free nitrogen into a usable form of nitrogen, formed by bacteria
What is nitrogen fixation?
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