carbon
Cells
The basic building block of all living organisms is the cell. The discovery that all living organisms are made up of cells is credited to the work of scientists Robert Hooke and Anton van Leeuwenhoek in the 17th century.
An "Atom" is the basic building block of all molecules [first] and [then] biomolecules.
Cells are the building blocks of all organisms.
cells.
The basic building block of all matter is the atom.
Cells are the building blocks of all organisms.
An Atom
Carbon
Cells!
Cells!
Atom