I think all of the above...
because I know they built aqueducts and sewers, so since 2 of they are correct, then all 3 must be.
Are there choices to choose from, because that is a very general question?
Eye spot allows to some protists to detect light. eye spot receiving light stimuli. eyespot which is a light sensitive organelle, which helps the chlamydomonas to swim toward the light. eyespot is also called the stigma. the eyespot is similar to an eye of human. it helps organisms pick up light waves to help the organisms live and function.
