Living cells were discovered by

$(a)$ Which major invention led to the discovery of the microscopic world?
$(b)$ Name a single cell which may constitute a whole organism. What are they called?
$(c)$ Every multicellular organism has come from a single cell. Justify the statement.

Name the processes by which $CO_{2}$ and $H_{2}O$ move into and out of the cell.

What is osmosis?

Name the scientist who discovered cells. List any two single-celled (unicellular) organisms.

Lipid molecules in the cell are synthesized by