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It depends on the school. Thich Nhat Hanh writes:
The Diamond Sutra teaches us that it is impossible to distinguish between sentient and non-sentient beings... In Buddhist monasteries, we chant, "Both sentient and non- sentient beings will realize full enlightenment." The First Precept is the practice of protecting all lives, including the lives of minerals.
(Source: http://dharma.ncf.ca/introduction/precepts/precept-1.html)