Once bacteria have fixed nitrogen, it can be taken up by plants and animals, where it is used in the production of Select one:
a. nitrogen oxides
b. carbohydrates
c. energy
d. proteins

When does the circulatory system work with the respiratory system? a. during blood cell formation b. during cellular respiration c. during intestinal digestion d. during a viral infection

What is the correct trna sequence that would match the following mrna sequence.gcgaua

Which of these statements is false? a. others may notice a problem with a relationship before the people involved. b. the first sign of a problem with a relationship is a feeling of anger. c. damaged relationships can be repaired. d. even good relationships can be damaged.