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Photosynthesis

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19 Terms

1

Photosynthesis

the process by which primary producers use sunlight to convert carbon dioxide and water into sugars, releasing oxygen

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2

Chemosynthesis

the process by which bacteria use energy stored in bonds of hydrogen sulfide to convert carbon dioxide and water into sugars

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3

Consumer

an organism that relies on other organisms for energy and nutrients; also called heterotroph

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4

Herbivore

an organism that eats plants

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5

Carnivore

an animal that kills and eats other animals,

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6

Omnivore

an animal that eats both plants and animals

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7

Detritivore

an organism that scavenges the waste products or dead bodies of other community members

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8

Decomposer

an organism (e.g., a fungus or bacterium) that breaks down nonliving matter into simple parts that can then be taken up and reused by primary producers

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9

Trophic level

a rank in a feeding hierarchy

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10

Biomass

the total amount of living tissue in a trophic level,

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11

Food chain

a linear series of feeding relationships

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12

Food web

diagram of feeding relationships and energy flow showing the paths by which nutrients and energy pass from organism to organism as one consumes another,

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13

Keystone species

a species that has a strong or wide-ranging impact on a community

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14

Primary succession

the somewhat predictable series of changes in a community that follows a disturbance so severe that no vegetation or soil life remains

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15

Pioneer species

one of the first species to colonize newly exposed land

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16

Secondary succession

the somewhat predictable series of changes in a community that follows a disturbance

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17

Invasive species

a nonnative species that spreads widely in a community

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18

primary producers

An autotroph, usually a photosynthetic organism. Collectively, autotrophs make up the trophic level of an ecosystem that ultimately supports all other levels.

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19

lichen

symbiotic association between a fungus and a photosynthetic organism

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