[G-Bear]

She has a bell button.....Does that mean she didn’t hatch out of an egg?

[allmendream]

The martians laid eggs that had photosynthetic shells. The eggs would sit for five years in a ‘green house’ incubator while they absorbed sunlight and grew. The nutrients from the photosynthetic shell and yolk sack had to enter the growing Dejah Thoris somehow - and the bellybutton would serve admirably. Quite a cute little bellybutton. ;)