Final answer:
A video is the most effective digital media element for a presentation on drowning signs due to its ability to show drowning cues in real time and enhance understanding.
Step-by-step explanation:
When doing a presentation on signs that indicate a person is drowning, the most useful digital media element would likely be a video. A video can effectively demonstrate the visual and physical cues associated with drowning, such as a person's expressions, movements, and behaviors that may be otherwise difficult to capture through static images or text alone. It provides an immediate and practical illustration of the situation, which can enhance understanding and retention of the material.
Infographics, while valuable in summarizing essential points and statistics, lack the dynamic element that shows how a drowning event unfolds in real time. Podcasts and blog posts can offer detailed explanations and personal narratives, but they do not provide the visual component that is particularly effective in conveying the urgency and subtleties of a drowning scenario. Therefore, incorporating multimedia content, particularly video, alongside supportive text, is vital in a presentation about drowning.