Why are unicelluar orginasims ussally small

The need for a large surface area through which to absorb nutrients from the environment is a major restriction on the size of a cell, and it's why single-celled organisms can only grow so large before they have to work together or divide into multicellular organisms.

Explanation:

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i think that the best answer would be c.

tell me if im wrong : )

answer; i do believe that the correct answer is; ///mendelian genes are at specific loci on the chromosome and, in turn, segregate during meiosis;