Vacuoles are round organelles found in both plant and animal cells. Their primary function is to - produce food and energy for the cell.
control the activities of the cell.
transport materials between parts of the cell.
store water, waste, and nutrients for the cell.

D.) store water, waste, and nutrients for the cell.

Explanation:

D is your answer because the vacuole is like a closet for the cell. It can store anything the cell may use later or it can store waste that is to be taken out of the cell at a later time as to not contaminate the rest of the organelles. In plant cells, it can also help with support since it is so big.  

a) the particles of the chair are strongly held together.

so here we go

atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137             subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54               subtract 54 from both sides.

40 = z

answer