A marine biologist wishes to test the hypothesis that heavy grazing by fish causes the brown alga Laminaria to stay short rather than grow
upright. Which of the following variables could be manipulated successfully at the shore to test this hypothesis?
ŠŠ.
add nutrients to the ocean water around the algae to see if it will grow taller
OB. increase the amount of dissolved carbon dioxide in the water around the algae to see if they grow taller
OC. place a netted screen around the algae to restrict fish from grazing on the algae and check for any change in growth
OD alter the intensity of light to see if this is the cause of the algae's stunted growth
O E. protect the algae from ocean waves to see if wave shock is causing the stunted growth
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