4. The illustration below represents an experiment with elodea (aquatic plant) and snails (Aquatic animal).
CU
А в с
Test tube A contains water, test tube B contains water and a snail, test tube C contains
water and elodea, and test tube D contains water, elodea and a snail.
What would be the best reason for having the lamp on during the experiment?
A The lamp would allow the snail to see the B. The lamp would keep the test tubes at 21
elodea.
C in order to maintain a stable climate.
c. The lamp will cause the elodea to grow D. The lamp provides energy for the elodea
rapidly.
to perform photosynthesis.