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Coal is mostly nitrogen, but it also contains small percentages of impurities.

Environmental systems can either be open or closed. Which best describes an open environmental system?

____is an example of an r-selected species.

Rapid climate change is due to

Cannibalism usually _____________ when food is in short supply and the density of individuals in the population increases.

Every species has a niche. Which of the following statements helps to accurately describe the opossum shrimp’s niche?

A tobacco plant that contains the phosphorescent genes of a firefly is an example of a ________.

Which set of components make up the best example of an ecosystem?

What is driving down the cost of electricity from solar power?

From a biological standpoint, why is sulfur important?