What do all protists have in common? check all that apply.

protists are organisms composed of one or more cells.
protists’ cells contain a nucleus.
protists live in dry environments.
protists produce their own food from water.
protists reproduce asexually or sexually.
protists live in moist environments.

Protista are unicellular organisms that do have a nucleus. They can reproduce both sexually and asexually. They live in moist environments.

Kingdom Protista consists of the organisms that are unicellular or pseudo multicellular and they are eukaryotic in nature.

The classes under Protista consists of Chrysophytes, Dinoflagellates, Slime moulds, Euglenoids and protozoans. These organisms are all unicellular. They are all the eukaryotic organisms. Euglenoids are photosynthetic where the protozoans are consumers and Slime moulds are saprophytic. They prefer to live in water or moist lands. These organisms can reproduce both asexually or sexually.

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the answer is:

carbon dioxide