The cell has a cytoskeleton made of microtubules and microfibers. Some microtubules have an end attached to a centrosome. The image shows the role played by the
centrosomes in a dividing cell.

it's diluted or concentrated

in a diluted solution, you can add a lot more solute but in concentrated only a little more can be added

a) carbon, hydrogen

b) carbon, hydrogen, oxygen, nitrogen

c) carbon, hydrogen, oxygen, nitrogen, phosphorus

d) sugar

e) amino acid

f) nucleotide