3.23 More on algal bloom control. The study described in Exercise 3.21 also examined the grazing effect of another species, Daphnia pulex, on the abundance of the nuisance alga G. semen in the lab. Here are the findings: Number of grazers . O 2 3 4 5 6 Net growth rate 0.7 -0.4-0.6-0.3-0.5 -1.0-0.2 (a) Make a scatterplot of number of grazers and net growth rate. Do you think that D. pulex is an effective grazer of the G. semen alga?(b) Find the correlation r. How does it support your interpretation? (c) The correlation between number of D. magna and net growth rate of G. semen in Exercise 3.21 was r = -0.93. Contrast the findings for the two grazing species and state your conclusions about the potential effectiveness of D. magna and D. pulex as ecological methods to control G. semen algal blooms