I think that the correct answer is reactants of photosynthesis.
Answer:prophase----the chromosomes shorten and thicken.the nuclear membrane has open up and the nucleolus has disappeared
Metaphase----the chromosomes migrate to the central plane of the cell and attach to the spindle fibres microtubules
Anaphase---the chromatids of each chromosomes part and move towards opposite poles of the spindle as the spindle fibres shorten
Telophase----the chromatids are in the polar end of the spindle .the spindle breaks down,the centrioles replicate,the nuclear membrane is reformed,the chromosomes gradually uncoil.
Explanation:
Stimulus: You get an injury.
Response: Your body begins to heal and recover.
V= IR ==> I = V/R
For A: I = 9/3 = 3 amps
for B: I = 3/(1/2) = 6 amps