Answer:
Nucleus holds the information needed to conduct most of the cell's functions (contains the hereditary material or also known as the DNA; responsible in the coordination of the activities of the cells, such as growth, metabolism, protein synthesis, and cell reproduction or division).
1. D. Argumentation
Argumentative essays is a genre of writing where a certain topic is discussed, explored and inspected. It often makes use of empirical research. The writer then chooses a side on the topic, explaining his opinion on the matter in a compelling, evidence-based essay. It usually uses first person to make the writer's ideas and stand on the issue clear and concise.
2. B. Credible
Sources are the basis for informed opinion. Thus, it must be credible.