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1st 9 wks exam chapter 3

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Question
Answer
scientific study of interactions among organisms and between organisms and their environment or surroundings   ecology  
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contains the combined portions of the planet in which all of life exists, including land, water, and air or atmosphere   biosphere  
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FIB: The biosphere extends from ___ kilometers about Earth's surface to as far as ___kilometers below the surface of the ocean   8; 11  
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a group of orgamisms so similar to one another that they can breed and produce fertile offspring   species  
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groups of individuals that belong to the same species and live in the same area   population  
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assemblages of different populations that lived together in a defined area   communities  
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collection of organisms that live in a particular place, together with their nonliving, or physical, environment   ecosystem  
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a group of ecosystems that have the same climate and similar dominant communities   biome  
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FIB: the main energy source for life on earth   sunlight  
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FIB: the sun's energy that reaches the earth's surface is about ____ percent used by living things   1  
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organisms that capture energy from sunlight or chemicals and use that energy to produce food   autotrophs  
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FIB: organisms that can capture energy from sunlight ion chemicals and use it to produce food from inorganic compounds   producers  
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process which plants and some other organisms use light energy to power chemical reactions that convert carbon dioxide and water into oxygem and energy-rich carbohydrates such as sugars and starches   photosynthesis  
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when organisms use chemical energy to produce carbohydrates   chemosynthesis  
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organisms that can rely on other organisms for their energy and food supply   heterotrophs  
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hexatrophs?   oonsumers  
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obtain energy y eating other plants   herbivores  
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eat animals   carnivores  
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eat both plants and animals   omnivores  
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feed on plant and animal remains and other dead matter   detritmores  
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break down organic matter   decomposers  
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a series of steps in which organisms tranfer energy by eating and being eaten   food chain  
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when the feeding relationships among the various organisms in an ecosystem form a network of complex interactions   food web  
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each step in a food chain or food web   trophic level  
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a diagram that shows that relative amounts of energy or matter contained within each tropic level in a food chain or food web   ecological pyramid  
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total amount of living tissue within a given trophic level   biomass  
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FIB: ___% of the body is made up of carbon, oxygen, hydrogen and nitrogen   95  
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list 4 things that make up 95 % of the body   carbon, oxygen, hydrogen and nitrogen  
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the process by which water changes from liquid form to an atmospheric gas   evaporation  
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loss of water from a plant through its leaves   transpiration  
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all the chemical substances that an organism needs to sustain life   nutrients  
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FIB: nitrogen gas makes up _____% of the earth's atmosphere   78  
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process to convert nitrogen gas into ammonia   nitrogen fixation  
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other soil bacteria convert nitrates into nitrogen gas   denitrification  
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the rate at which organic matter is created by producers   primary productivity  
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when an ecosystem is limited by a single nutrient that is scarce or cycles very slowly   limiting nutrient  
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when an aquatic ecosystem receives a large input of a limiting nutrient   algal bloom  
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