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.
This is a very easy paragraph analysis question. The answer is c. "Over time, scientific knowledge is reevaluated and extended through new scientific research." The reason why the answer is C., is because the chronological order of the study of genetics is as follows:
- Mendel does his pea plants experiments, but did not know how traits were passed to the offspring.
- Avery concludes that DNA is the "material" that passes on traits to the offspring, probably using Mendel's research and his own research (pneuonimia virus research) as well.
- Since the existence of DNA was published, Watson and Crick used it to identify an accurate model of the structure of DNA, using the four bases: cytosine, adenine, guanine, and thymine.
Overall, we see a trend of scientists publishing results based on what scientists did before.
The group that will the have the most members in a given area will be a community. Community is comprised of a population of organisms grouped into genus with different species. According to the level of organization of living things, we can arrange the options from simple to complex as: species, genus, population, and community.
