Given the question: Question: Why do the giant pods heading to neighboring towns? If there is no answer, please output "Insufficient information to provide an answer.". Movie title: Invasion of the Body Snatchers Context: On an unidentified planet, a strange lifeform in the shape of gel-like spores drifts up into the atmosphere, where it moves slowly through space, drifting until it reaches Earth. The spores enter the atmosphere and are swept downward, emerging in a rainstorm in San Francisco. On the ground, the spores begin to develop, growing on leaves of earthly plants and taking the shape of small pods with a pink flower in the middle.Elizabeth Driscoll (Brooke Adams) notices one of the pods, taking it back to the home she shares with her boyfriend, Geoffrey (Art Hindle). Unable to find the flowering pod in any of her botany books, she hesitantly identifies her new find as a cross-breeding of two different species, a "grex."Matthew Bennell (Donald Sutherland) is an inspector for the health department who uncovers unsanitary conditions at a French restaurant. As he threatens the owner with indictment over finding rat droppings in the food, the other employees quietly slip out to the parking lot and smash Matthew's windshield with a bottle of wine. Matthew is cold and calculating, refusing to let them see his frustration at finding his car vandalized, but when he gets home he calls Elizabeth. They work together at the health department, and Matthew jokes with her about what happened to him at the restaurant. As Elizabeth goes to bed, she forgets about the weird pod, which has suddenly sprouted roots in the glass of water she keeps it in next to their bed.When Elizabeth wakes the next morning, Geoffrey is already awake and dressed, cleaning up the remains of the glass of water next to the bed, as well as some other, unidentifiable mess (resembling some kind of dust). His behavior is strange, and she follows him downstairs as he takes a plastic garbage bag out to a waiting dump truck. At work, she confides to Matthew that Geoffrey is acting strange. Later that night, Elizabeth tries to talk it over with Geoffrey but he ignores her, instead telling her that he's going out and giving her no explanation. Elizabeth touches him...
The answer is:
to be planted and used to replace their populations