Answer:
B. Leaves provide a place for photosynthesis to occur.
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Answer:
C. antigen-antibody reactions
Explanation:
human blood group is determined by the presence of antigens on the red blood cells which are specific proteins.
so specific antibodies are used against these antigens to determine the type of blood group after the reaction.
The possible number of main effect is THREE.
Main effects refers to the major conditions that are specify in the experiment; these are: room temperature, noise level and room colour. These three factors are manipulated in the designed experiment.
