Question

uncontrolled growth of cyanobacteria causes major dead zones in lakes, where plants and aquatic animals are starved of oxygen and die. cyanobacteria growth is believed to be affected by the increased use of fertilizers that run - off into lakes and rivers. with so many different types of fertilizers, it is vital to determine which ones are causing the most growth, to avoid or limit their use. which of the following is the most likely independent variable in this study? rate of cyanobacteria growth different lakes different fertilizers different water temperatures

Explanation:

Step1: Define independent variable

An independent variable is manipulated to observe its effect on another variable.

Step2: Analyze the study

The study aims to see which fertilizers cause the most cyanobacteria growth. Fertilizers are being varied.

Step3: Identify the independent variable

Since different types of fertilizers are being tested to see their impact on cyanobacteria growth, different fertilizers are the independent variable.

Answer:

C. different fertilizers