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Miller ch. 3&4
Living In The Environment 16th Ed. Ch. 3&4 vocab.
Question | Answer |
---|---|
biomass | the dry weight of all organic matter contained in its organisms. |
carnivores | animal that feeds on other animals. |
community | consists of all the populations of different species that live in a particular place |
consumers | cannot produce the nutrients they need through photosynthesis or other processes and must obtain their nutrients by feeding on other organisms (producers or other consumers) or their remains. |
decomposers | Organism that digests parts of dead organisms. |
herbivores | plant-eating organism. |
habitat | The place where a population or an individual organism normally lives is its habitat. |
omnivores | such as pigs, foxes, cockroaches, and humans, play dual roles by feeding on both plants and animals. |
population | is a group of individuals of the same species that live in the same place at the same time. |
primary consumers | animals such as rabbits, grasshoppers, deer, and zooplankton that eat producers, mostly by feeding on green plants. |
producers | make the nutrients they need from compounds and energy obtained from their environment. |
secondary consumers | organism that feeds only on primary consumers |
species | For a group of sexually reproducing organisms, a species is a set of individuals that can mate and produce fertile offspring. |
trophic level | Ecologists assign every organism in an ecosystem to a feeding level, or trophic level, depending on its source of food or nutrients. |
adaptation, or adaptive trait | any heritable trait that enables an individual organism to survive through natural selection and to reproduce more than other individuals under prevailing environmental conditions. |
background extinction | Throughout most of history, species have disappeared at a low rate, called background extinction. |
biological evolution | the process whereby earth’s life changes over time through changes in the genes of populations. |
differential reproduction | Phenomenon in which individuals with adaptive genetic traits produce more living offspring than do individuals without such traits. |
ecological niche | total way of life or role of a species in an ecosystem. |
endemic species | Species that are found in only one area are called endemic species and are especially vulnerable to extinction. |
extinction | Another process affecting the number and types of species on the earth is extinction, in which an entire species ceases to exist. |
foundation species | species that plays a major role in shaping a community by creating and enhancing a habitat that benefits other species |
generalist species | species with a broad ecological niche. |
geographic isolation | occurs when different groups of the same population of a species become physically isolated from one another for long periods. |
indicator species | Species that provide early warnings of damage to a community or an ecosystem are called indicator species. |
keystone species | species that play roles affecting many other organisms in an ecosystem. |
mass extinction | is a significant rise in extinction rates above the background level. |
mutations | random change in DNA molecules making up genes that can alter anatomy, physiology, or behavior in offspring. |
native species | those species that normally live and thrive in a particular ecosystem. |
natural selection | Process by which a particular beneficial gene is reproduced in succeeding generations more than other genes. |
nonnative species | Other species that migrate into or are deliberately or accidentally introduced into an ecosystem are called nonnative species, |
reproductive isolation | mutation and change by natural selection operate independently in the gene pools of geographically isolated populations. |
specialist species | Species with a narrow ecological niche. |
speciation | Under certain circumstances, natural selection can lead to an entirely new species. In this process two species arise from one. |
species diversity | number of different species combined with the relative abundance of individuals within each of those species in a given area. |