Answer:
Recent studies have examined the possibility that variation in species richness within communities may influence productivity leading to an exploration of the relative effect of alterations in species number per se as contrasted to the addition of productive species.
Explanation:
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The two serous membranes of pericardium are :visceral pericardium,parietal pericardium.
<span>The end product of the radioactive decay of uranium is a non-radioactive lead isotope.
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Its B since the lower leaves need sunlight to make food (photosynthesis)
