Based on this figure, the ________ must have contained two nuclei before fertilization. 
Definitions:
Frescoes
A method of mural painting executed upon freshly laid lime plaster, water is used as the vehicle for the dry-powder pigment to merge with the plaster, and with the setting of the plaster, the painting becomes an integral part of the wall.
Santa Maria Novella
A famous church in Florence, Italy, notable for its Gothic and Renaissance architectural elements and art.
Brunelleschi
Filippo Brunelleschi was an Italian designer and a key figure in architecture, recognized for developing the principles of linear perspective.
Oculus
A circular opening at the top of a dome or wall, used in architecture to let in light or air.
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