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science flachcards

ch.18 flashcards

tissue a group of similar cells that perform a common function organ a collection of tissues that carry out a specialized function of the body consumer an organism that eats other organisms or organic matter energy pyramid a triangular diagram that shows an ecosystem's lost of energy which results as energy passes through the ecosystems food chain
organs system a group of organs that work together to perform body functions organism living thing. Some organisms are composed of a single cell. Other organisms are composed of many cells. carnivores an organism that eats animals carrying capacity the largest population that an environment can support at any given time
population group of living things of the same species that live in a specific area. community all of the populations of species that live in the same habitat and interact with each other decomposers an organism that gets energy by breaking down the remains of dead organisms or animal wastes and consuming or absorbing the nutrients prey an organism that is killed and eaten by another organism
ecosystem a community of organisms and their abiotic, or nonliving, environment biome a large region characterized by a specific type of climate and certain types of plant and animal communities food web a diagram that shows the feeding relationships between organisms in an ecosystem commensalism a relationship between two organisms in which one organism benefits and the other is unaffected
biosphere the part of Earth where life exists; includes all of the living organisms on Earth producers organisms that make their own food, usually by using the energy from sunlight to make sugar. food chain the pathway of energy transfer through various stages as a result of the feeding patterns of a series of organisms symbiosis a relationship in which two different organisms live in close association with each other
coevolution when a long term change happens in two species because of their close interactions.
abiotic describes the nonliving part of the environment, including water, rocks, light, and temperature biotic describes living factors in the environment tropic level Each of several hierarchical levels in an ecosystem, comprising organisms that share the same function in the food chain and the same nutritional relationship to the primary sources of energy mutualism a relationship between two species in which both species benefit
ecology the study of the interactions of living organisms with one another and with their environment cell the smallest functional and structural unit of all living organisms; usually consists of a nucleus, cytoplasm, and a membrane energy the capacity to do work predator an organism that kills and eats all or part of another organism
herbivore an organism that eats only plants omnivores an organism that eats both plants and animals scavenger An animal that feeds on carrion, dead plant material, or refuse. parasitism a relationship between two species in which one species, the parasite, benefits from the other species, the host, which is harmed