The physical basis of life is known as .......

$(P) \rightarrow$ Subatomic particles $\rightarrow$ Atoms $\rightarrow$ Molecules $\rightarrow (Q) \rightarrow$ Cells $\rightarrow$ Tissues. Which levels do $(P)$ and $(Q)$ represent in the given hierarchy of biological organization?

What is the full form of the unit $(1) \, \text{nm}$?

Which of the following is the smallest cell?

Which of the following is the living substance found in a cell?

The jelly-like substance present inside the cell is known as: