A Rancher Wants to Ensure That Her Cattle Will Get

A rancher wants to ensure that her cattle will get sufficient food by grazing on her grassland ecosystem every year, regardless of the year's temperature and precipitation levels.She knows that to ensure this, she must maintain high species diversity in the grassland.This is because high species diversity has all the following effects except

A) making the ecosystem more stable, or more able to recover from disturbances.
B) using ecosystem resources more completely and efficiently.
C) ensuring that some species can persist even if the environment changes.
D) compensating for low abundance of one species with an increased abundance of another.
E) preventing any species from going extinct under extreme conditions.

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