Answer:
D. the American Revolution
Explanation:
The answer is D because you want to have a control group! Hope it helps!
The sentence "<span>This is a method of researching studying a topic, examination, inquiry",
denotes to "Investigation" in scientific research. As the
sentence breaks down the method in various stages like research, study,
examination and inquiry, all of them are the essential parts of an
investigation in scientific methods. </span>
The correct answer is C. Energy from the sun is converted into food energy by producers, which is then passed on to consumers.
Explanation
The trophic levels are a form of organization for the species of an ecosystem based on the turn they have in the distribution of the energy flow. This organization is made up of four levels, in the first are the producers, which are plants, trees, shrubs and flowers; in the second level are the primary consumers who are herbivorous animals; in the third level are the secondary consumers, omnivores and some predators and in the fourth level are the tertiary consumers that are omnivores and large predators. According to this organization, it can be said that energy is absorbed by plants and converted into their food, and is subsequently transmitted to primary consumers (herbivores) after they feed on plants. So the correct answer is C. Energy from the sun is converted into food energy by producers, which is then passed on to consumers.
