i believe it is the last one
Answer: producers
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Answer:
Directly counting blood cells or tissue cells by using a hemocytometer can determine the concentration of a known volume. Counting the number of colonies that arise on a pour plate can calculate the concentration by multiplying the count by the volume spread on the pour plate.
<span>Each year, an average person in the United States is exposed to a radiation level of 360 mrem, which is the whole body equivalent dose from the background sources. Most of the radiation is the result from the natural sources. However, this value is also an indication of radiation caused by non-natural sources.</span>