The concept of "Omnis cellula-e cellula" regarding cell division was first proposed by

$1 \, nm$ is equal to

Assertion $A$: Every cell is a wonderful marvel of the world. Reason $R$: $A$ cell takes in nutrients,converts them into energy,and performs specialized functions. Which option is correct for Assertion $A$ and Reason $R$?

The size of Pleuropneumonia-like organism $(PPLO)$ is

The smallest part of a living organism is....

The names of $Schleiden$ and $Schwann$ are associated with which of the following?