D. a protective membrane, because they surround<span> the cell
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The correct answer is:
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C.asthenosphere </span><span>
If I made a mistake feel free to tell me ^-^
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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.
Answer:
I have nothing to go on. You need to include some pictures or add more data.
Explanation:
the factors are light intensity, carbon dioxide concentration and temperature. So you know which one is.
