What are the essential components of a biological drawing heading?

A good biological drawing heading should include:

• The identity of what you have drawn (e.g., "Onion Epidermal Cells").
• The magnification or size (e.g., "x100" or a scale bar).
• The type of view (e.g., "Longitudinal Section," "Transverse Section," "Whole Mount").

The shape of the organism is depicted in the drawing itself, not explicitly stated as a vital element in the heading.

The final answer is $\text{A}$