Teacher:In this task you will be given a process, and a question. The process contains a sequence of steps that happen in order. The question asks about the effect of a certain event on another event. If the first event has a positive effect on the second event, answer with "for", if it has a negative effect, answer with "against". If there's no causal relationship between the two, answer with "none".
Teacher: Now, understand the problem? Solve this instance: Process:  -Bats and other animals produce a high-pitched tone -The sound travels in waves, as sound does -The sound 'bounces' off of a nearby object -The sound wave returns to the bat -The bat hears the echoed sound -Folds in the bat's ear and adaptations in the bat's brain enable it to determine the size, shape, and position of the other object via the properties of the returned sound waves -Other animals use echolocation in generally similar ways -
 Question: What is the effect of fewer objects around to bounce sound off of on stronger echolocation.?
Student:
against