Alexia is testing the effect of adding salt on the conductivity of distilled water. To do this, Alexia took 5 beakers and filled them each up with 50mL of room temperature distilled water. She added 0g of salt to beaker 1, 10g to beaker 2, 20g to beaker 3, 30g to beaker 4 and 40g to beaker 5. She stirred each beaker for 10 seconds and then measured the conductivity. What is the independent (testing) variable?

A Group of answer choices

B the amount of salt in each beaker

C the beaker with no salt

D the conductivity of the beaker

the length of time she stirred the beaker

Ali hypothesized that increasing fertilizer would increase plant growth. four groups of thirty similar plants were given 0 to 15 ml of fertilizer, as shown in the graph. the change in plant height for each group over a two-week period was averaged and recorded. plant group fertilizer added (ml) avg. growth (cm) a 0 4 b 5 6 c 10 8 d 15 3 what is the best conclusion based on this data? the hypothesis was not supported because the data indicated that fertilizing plants does not improve plant growth. the hypothesis was supported; to get the best growth, use 5 milliliters of fertilizer per plant. the hypothesis was not supported; the data indicated that too much fertilizer can inhibit plant growth. the hypothesis was supported; to get the best growth, use 15 milliliters of fertilizer per plant.