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What is turgor pressure, what causes it, and what does it do for a plant?

Anormal strand of dna is shown below, followed by the same strand of dna after mutations have occurred.

Ascientist is designing an investigation to study the impact of invasive bird populations on local, native bird populations at backyard bird feeders. what population is most likely to be a control group for the investigation? amount of food number of bird feeders invasive bird populations local backyard birdfeeders without food