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As of fall 2019, multiple changes have been made to the AP Environmental Science exam. These changes include but are not limited to: allowed calculator use, changes in the number of multiple choice questions, the use of stimuli in multiple choice questions, and changes in free response questions.
In late 2016 the app WikiFlip was launched as the third app in the WOK ecosystem of quiz apps. All apps have been developed for Android and iOS mobile smartphones. [2] All apps in WOK are based on the database of multiple choice questions with four alternatives, one being factually correct and three alternatives being incorrect.
An ecosystem (or ecological system) is a system formed by organisms in interaction with their environment. [2]: 458 The biotic and abiotic components are linked together through nutrient cycles and energy flows. Ecosystems are controlled by external and internal factors.
The relationship between law and ecosystems is very ancient and has consequences for biodiversity. It is related to private and public property rights. It can define protection for threatened ecosystems, but also some rights and duties (for example, fishing and hunting rights). [citation needed] Law regarding species is more recent.
Ecosystems may be habitats within biomes that form an integrated whole and a dynamically responsive system having both physical and biological complexes. Ecosystem ecology is the science of determining the fluxes of materials (e.g. carbon, phosphorus) between different pools (e.g., tree biomass, soil organic material).
A biome encompasses multiple ecosystems within its boundaries. It can also comprise a variety of habitats . While a biome can cover small areas, a microbiome is a mix of organisms that coexist in a defined space on a much smaller scale.
Ecosystems may transition from one stable state to another, in what is known as a state shift (sometimes termed a phase shift or regime shift), when perturbed. Due to ecological feedbacks, ecosystems display resistance to state shifts and therefore tend to remain in one state unless perturbations are large enough.
A central question in the trophic dynamic literature is the nature of control and regulation over resources and production. Ecologists use simplified one trophic position food chain models (producer, carnivore, decomposer). Using these models, ecologists have tested various types of ecological control mechanisms.