Which of the following structures in the human body has the highest level of organization? atoms

tissue
cells
organ systems

Restriction enzymes are used in making recombinant dna. describe the role restriction enzymes perform when constructing recombinant dna.

Guard cells control which event? the growth of plants capture of solar energy gas exchange in leaves water absorption in roots

The two tubes contain bromothymol blue. after 24 hours, what will the color of the water be in tube b? a. green (it won't change) b. yellow c. blue d. colorless (clear)