(B) The correct answer is $B$. Deserts are characterized by extremely low annual precipitation,typically $25 \text{ cm}$ $(10 \text{ inches})$ or less

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(B) The correct answer is $B$. Deserts are characterized by extremely low annual precipitation,typically $25 \text{ cm}$ $(10 \text{ inches})$ or less. This severe water limitation is the primary abiotic factor that restricts plant growth and results in poor vegetation cover and low primary productivity in desert ecosystems.