Sorry this is late, but the answer is B. biotic.
Chloroplast: this is the site of photosynthesis in plants
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the difference between the mass of an isotope and its mass number.
Explanation:
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Each pollinator uses flowers with specific characteristics as its niche.
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Control comes with regulating the amount of radiation that a patient is exposed to (using a dosimeter) while accomplishing the task required – such as taking radiology images or irradiating tumor cells. Regulating radiation levels include ensuring the right distance between the patient and radiation source and implementing requisite shielding techniques. The time duration for exposre should be short and radiation sources should also be labeled accordingly.