Final answer:
The central idea concerns the role of infrasound in animal behavior, with a focus on how it facilitates long-distance communication among animals like elephants and whales.
Step-by-step explanation:
The central idea of "Roars, Snorts, and Infrasounds" appears to focus on D) The role of infrasound in animal behavior. Infrasounds are low-frequency sounds that are below the human range of hearing, utilized by some animals to communicate over vast distances. Elephants and whales rely on this method for long-distance communication, as infrasound waves travel farther and are less likely to be absorbed by the environment compared to high-frequency sounds. This is advantageous in dense environments like forests or across large expanses of water. Infrasound signals can convey important information regarding territory, mating opportunities, or potential threats. Animal communication significantly impacts their survival and plays a crucial role in their natural selection process.