Which of the following forest management practices keeps the forest in a state of mid to late succession?

option a and d is the correct answer

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plz mark as the brainliest answer

many other transport proteins, often called pumps, move materials against a concentration gradient. active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration. this process, shown in figure 5.1, uses transport proteins powered by chemi- cal energy.