Which statement best explains why carbon is present in so many kinds of molecules? it is abundant on earth. it can form four covalent bonds. it has valence electrons. it can become an ion.

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

Which statement best describes lactic acid fermentation? a. lactic acid fermentation is the first step of cellular respiration. o b. lactic acid fermentation is the final step of cellular respiration. re to berate c. in the absence of oxygen, cells release atp by breaking down lactose into glucose. e der lade res o d. in the absence of oxygen, cells release atp by breaking down glucose into lactate. ar

This is the interaction of two organisms where one is and the other is neither nor harmed.