How are the cells in multicellular organisms different from those in single-celled organisms?
A. Cells in multicellular organisms do not have nuclei.
B. Cells in multicellular organisms are smaller than cells in single-celled organisms.
C. Cells in multicellular organisms do not move.
• D. Cells in multicellular organisms are specialized to perform certain functions.

Option D) Cells in multicellular organisms are specialized to perform certain functions.

Explanation:

Multicellular organisms include humans, reptiles, birds etc. While unicellular organisms include amoeba, paramecium etc

From the examples given, the cells of multicellular organisms are specialized in function in that:

- cells that perform similar functions are put together as tissues, organs or system e.g digestive system consists of the similar cells that help to break down food into pieces

On the other hand, unicellular organisms possess just one cell that do all the functions.

Thus, the difference between both is that cells in multicellular organisms are specialized to perform certain functions.

genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).