Which visual should Kevin use in his paper to help explain the different chambers of the heart?

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A. a timeline
B. a map
C. a diagram
D. a graph

C. a diagram

To determine which visual Kevin should use in his paper to explain the different chambers of the heart, let's break down the options:

A. A timeline: A timeline would not be an appropriate visual to explain the different chambers of the heart. Timelines are typically used to show a sequence of events or the passage of time.

B. A map: A map is also not suitable for explaining the different chambers of the heart. Maps are used to illustrate geographical locations, and they wouldn't accurately represent the anatomical structure of the heart.

C. A diagram: This is the best option out of the given choices. A diagram is an appropriate visual to explain the different chambers of the heart because it can accurately depict the anatomical structure and show the relationships between the chambers.

D. A graph: Graphs are used to represent data and show patterns or trends. Since the different chambers of the heart are not related to numerical data or quantitative measurements, a graph would not be an effective visual for Kevin's purpose.

Therefore, the correct answer is C. Kevin should use a diagram in his paper to help explain the different chambers of the heart.