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.
A pipette is a thin/narrow glass tube that is used to transfer liquids. A spatula is a steel utensils used to scrape, transfer, and apply powders and pastes. A test tube is a glass or plastic tube that is used for holding, mixing, and heating liquid chemicals. A graduated cylinder is a skinny long cylinder used for measuring volumes. So the instrument that would best suitable for holding a liquid while heating it over a flame is a test tube. so the answer is C.
<span>hypothalamus
The body has an "indoor regulator" that controls our body's temperature. It is a part of our cerebrum called the hypothalamus. The hypothalamus controls your body's reactions to outside temperature. When we get hot, we sweat. It interface the sensory system to the endocrine framework through the pituitary organ</span>
The remains of an animal or plant preserved within a layer of rock.
