Cells contain specialized parts, known as organelles, to perform special tasks, such as waste disposal, protein building, and movement. even though these basic cellular functions occur in all cells,

Explanation:

The complete question is

Cells contain specialized parts, known as organelles, to perform

specific tasks, such as waste disposal, protein building, and

movement. Even though these basic cellular functions occur in

all cells,

A. all cells do not perform the same exact functions in

unicellular organisms.

B. the cellular components are not at all related to the overall

function of the cell.

C. the cells in unicellular organisms and all the cells in

multicellular organisms must perform the same functions.

D. all cells do not perform the same exact functions in

multicellular organisms.

Solution -

In multi cellular organism, the cells perform similar function only up to a certain stage of development of organism after which the cells get specialized and become part of different organ system and thus each cell performs a different function. For instance, cells of liver and heart will perform different activities  

However, unicellular organism consists of only one cell thus all the essential functions of life are performed by that single cell only.

Thus, option D is correct

layer 3 is younger than layer 6.