20. How does bacteria contribute to the nitrogen cycle?* bacteria can release free nitrogen into the air and fix free nitrogen into simple
compounds
bacteria can eat nitrogen compounds
bacteria does not contribute to the nitrogen cycle
bacteria can change nitrogen into carbon

Which of the following is a macronutrient? carbohydrates lipids amino acids all of the above

Which organelles are labeled d, and what is one feature that distinguishes them from the other labeled organelles chloroplasts the only organelles that produce sugars from sunlight mosomes, only found in animal and bacterial cells centricles only found in animal cells mitochondra, the only energo-generating structures found in cells

Isolated volcanic peaks on the ocean floor are