Determined if the sequence is arithmetic. if it is state the common difference

the "dirty dozen" chemicals banned in an international treaty are formally known as persistent organic pollutants, or pops. the united nations environment program provided this background on what they are and what they can do to humans and wildlife.

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a population changes in response to a change in the environment.

if the type of the food available changes, then the frequency of beak types will change, because birds with beaks more suited to the available food will be more successful over time.

the supermassive black hole is in the middle of the galaxy.