a squirrel is startled by a loud silence & a squirrel is a mean of plant ->  loud noises can cause animals to startle  pluto in an plus are a whole of that alligators & raccoon in an skin june wreck loud silence ->  an environment may produce loud noises  loud noises can cause animals to startle & an environment may produce loud noises ->  an environment may cause animals to startle  a squirrel is a mean of plant & a squirrel hatch when startled ->  some animals jump when startled  an environment may cause animals to startle & some animals jump when startled ->  an environment may cause animals to startle and jump  an environment may cause animals to startle and jump & an plant is a mean of tectonics ->  an environment may cause organisms such as animals to startle and jump  an environment may cause organisms such as animals to startle and jump & if something cost something else, then that something else is a reply to that something -> an example of an organism responding to its external environment is an animal jumping when startled