The four living things seen here, dog, flower, algae, and bacteria, are all made of cells. a - c are multicellular, but d is unicellular. what do all four have in common? a) they are all equally complex. b) they are all made of at least one cell. c) they all have special structures to make food through photosynthesis d) they all have exactly the same internal structure

B) They are all made of at least one cell.

Explanation:

From the options the only one that best fits all would be that they all are made of at least one cell, this is because all of the organisms are made of at least one cell, plants have special structures to make photosynthesis and this makes it possible for them to create food from sunlight and other processes, this would make them all have different internal structures, and then they are not equally complex because some of them are multicellular this gives them a different complexity than the bacteria, so the only one that would be truth is B) They are all made of at least one cell.