[Solved] A star has an apparent visual magnitude of +19. Which will you need to see this star A)naked eye B)binoculars C)telescope like Hubble Space Telescope D)All of the other choices can be used. Echoes: Reflected sound waves that return to the listener, allowing organisms or devices to locate objects and navigate environments through echolocation. Hypothesis: A proposed explanation for a phenomenon, made as a starting point for further investigation, which can be tested through experimentation or observation. Male Song Sparrows: A species of birds known for their complex vocalizations used in territory defense and mating, focusing on the male's role in these behaviors. Physical Condition: The state of an organism's body, including strength, fitness, and overall health, often influencing its ability to survive and reproduce.