pollution is the only way that humans can cause changes to ecosystems.; rising levels of carbon dioxide most likely; how do the benefits of natural change to ecosystems compare to the disadvantages?; habitat change can occur through natural causes.; climate warming trends allow plant and insect species to inhabit larger ranges.; succession occurs when environmental factors affecting an ecosystem change.; how does an early onset of spring through climate change affect plants?; which of the following is not a possible effect of rising carbon dioxide levels on plants?

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