Why is the movement of water on Earth important?
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Biology, 21.06.2019 17:00
How many trophic levels are there in the following food chain? phytoplankton - shrimp - perch - pike - osprey
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Which of the following occurs after a natural or unnatural disturbance in an ecosystem
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What does polymerase chain reaction (pcr) do? o a. separates dna fragments by size o b. cuts a dna sample into fragments o c. provides an overall picture of a person's chromosomes o d. makes more copies of a sample of dna
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