Can a flatworm detect every stimulus in its environment?

Explanation:

Planaria (earthworms,flatworms ) are sensitive to many stimuli including: chemical gradients, texture, etc. When a Planarian is placed in a novel environment, there is an initial exploratory phase. he planaria can perfectly regenerate all elements of its morphology.

answer; /// i believe that the correct answer is ( monophasic ); ethinyl estradiol- ethynodiol diacetate is a monophasic oral contraceptive agent; ///

i think its control and coordinate because im pretty sure thats what tissue does and the joints are what control movement and then your skeletal/ bones provides portection. hope that .