What are the working modes of AFM imaging?

Compare and contrast nutrient limitation in soil vs. nutrient limitation in aquatic ecosystems

What links the two strands in a dna helix together in the middle? a. phosphate groups b. sugar rings bonded together c. proteins d. bases with hydrogen bonds

When is your respiration rate likely to change? a. when your intestines are digesting b. when your cells have too much glucose c. when your cells need more oxygen d. when your liver is working after a meal