How is e. coli like a paramecium?
a. both are unicellular
b. both have a contractile vacuole
c. both have a nucleoid
d. both produce essential vitamins.

which statement is one of the three parts of cell theory?

a. cells make up tissues, tissues make up organs, organs make up systems, systems make up organisms.

b. there are three types of cells, prokaryotic, eukaryotic plant, and eukaryotic animal.

c. the smallest living things are single cells, and cells are the functional units of multicellular ogranisms.

d. cell organelles can be membrane-bound or not membrane bound.

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The correct answers first question is A. both are unicellular, and second question is C. the smallest living things are single cells, and cells are the functional units of multicellular ogranisms.

Explanation:

Both E.coli and paramecium are unicellular organisms that means they are made up of a single cell. E.coli is prokaryote so it does not have membrane-bound organelles but paramecium has membrane-bound organelles so it comes under eukaryotes. Therefore, the correct answer is A.both are unicellular.

Cell theory was proposed by Theodor Schwann, Matthias Schleiden, and Rudolph Virchow. According to cell theory, all living things are made up of cells. Cell is the smallest unit of life and it is also a functional unit of multicellular organisms and new cells arise from old cells.

So the correct answer is the smallest living things are single cells, and cells are the functional units of multicellular organisms.