DDT was used during second world war to control malaria among the troops and the civilians. Later, it was used as pesticide in agricultural and household practices. Due to its excessive use it entered into the food chain and its amount in the food crossed the permissible level. So, it was banned by United States.
Answer:
Alyssa is observing two cells, X and Y. Each cell is from either a plant or an animal. She records some of her observations in a chart.
cell X and cell Y
one has chloroplast the other does not
food vacuole is big in one while it is smaller in the other
Explanation:
Answer:
What the scientist is doing incorrectly is disposing of a chemical or biological waste in the common sewer.
Explanation:
One of the most important biosecurity measures is the proper disposal of chemical and biological waste. What the shown scientist is doing incorrectly is disposing of potentially harmful substances in a normal sewer.
<h3>What could he do to make their work in the lab safer?
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The main thing that must be done to maintain a safe laboratory is to perform proper disposal of chemical or biological waste, which must be placed in airtight containers and transported to a location for safe disposal.
- <em>Chemical waste is usually taken to a landfill where it can be neutralized.
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- <em>Biological waste is transported to incinerators for complete disposal.
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<h3>Why is it important to follow these procedures?
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Following these procedures is important to avoid chemical or biological contamination of both the environment and people.
<span>B) adding wood to a burning fire to increase the heat
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