Who studied different types of cells and reported that cells had a thin outer layer?

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

Which of the following is the "physical basis of life"?

$A.$ Mycoplasma, the smallest cells, are only $0.3 \mu m$ in length.
$B.$ Size of bacteria could be $3$ to $5 \mu m$.
$C.$ Human red blood cells are about $7.0 \mu m$ in radius.

In terms of size, which category do atoms fall into?

The cell theory states that