Which of the following statements is false?
protists are eukaryotes.
some protists can conduct photosynthesis.
protists can reproduce by fission.
protists are all unicellular.

The incorrect statement is that protists are all unicellular.

Explanation:

Not all the protists are unicellular, there are some species of protists, which are multicellular too. The kingdom Protista comprises unicellular as well as eukaryotic species. The kingdom Protista is very diverse and comprises almost all the kinds of species beginning from unicellular species to multicellular, non-photosynthetic to photosynthetic and others. Some of the unicellular protists are paramecium, euglena, amoeba, while some of the multicellular protists are slime molds, kelp, and red algae.

stimulus is a change in the environment that causes an organism to react. the response is the reaction to the stimulus. some examples of stimuli for zebras are drought, to many predators, and bad feeding grounds such as dead grass or plants. zebras respond to stimuli just like all other living organisms