I and III.
Chargaff's law and Rosalind Franklin's discoveries
A courtship dance or mating ritual hope this helped
The Cell Membrane<span>. All living cells and many of the tiny organelles internal to cells are bounded by thin </span>membranes<span>. These </span>membranes<span> are </span>composed<span> primarily of phospholipids and proteins and are typically described as phospholipid bi-layers.
~Hope This Help</span>
