Answer:
2)
Explanation:
The positive control is the treatment where bacteria grew without lead. Since positive control indicates the presence of bacteria in the experimental conditions, it is possible to confirm that they only death in presence of this metal. However, it is important to note that it is imperative to repeat this experiment three times and also to include a negative control in order to confirm these results.
<span>A. genetic variation in species
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The following are exclusively functions of the female reproductive system: nourishing a developing baby, protects the developing offspring, and serves as place where fertilization takes place.
