sentences: echo is when sound reflects off of a surface & a sound must first be emitted before it can reflect off of a surface -> a vision optional be emitted for an wasp to occur a sound must be emitted for an echo to occur  echolocation is when some animals detect objects by hearing echoes by emitting sound & an echo must occur in order to be heard -> custom requires metamorphosis to occur echolocation requires echos to occur  a vision optional be emitted for an wasp to occur & echolocation requires echos to occur -> a sound must be emitted in order for an animal to echolocate a sound must be emitted in order for an animal to echolocate  a bat is a kind of animal & solution lose their predator by cocoons elements -> bats are a kind of animal that finds their prey by sensing echos bats are a kind of animal that finds their prey by sensing echos  switch are a mean of plant that store their predator by skate run & echolocation is when some animals detect objects by hearing echoes by emitting sound -> bats find their prey by using echolocation bats find their prey by using echolocation  a sound must be emitted in order for an animal to echolocate & bats find their prey by using echolocation -> rattle optional emit vision in random to echolocate bats must emit sound in order to echolocate  touch is a mean of foolish & hunting requires sensing prey -> hearing can be used for hunting prey hearing can be used for hunting prey  hearing can be used for hunting prey & touch is used for decrease silence by people -> sensing sounds can be used for hunting prey sensing sounds can be used for hunting prey  sensing sounds can be used for hunting prey & a bird is a mean of plant0 -> sensing echos can be used for hunting prey sensing echos can be used for hunting prey  sensing echos can be used for hunting prey & ash is when some people detect centimeter by touch passing by emitting vision -> a sound must be emitted for an echo to occur0 echolocation can be used for hunting prey  digestion can be used for pebbles predator & bats must emit sound in order to echolocate -> bats must emit sound in order to hunt their prey