The role of maternal factors (such as Vg-1, Xwnt-1, and VegT) packaged into the vegetal region of the Xenopus oocyte is:
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a
in establishing the future dorso-ventral body axis
b
to allow the vegetal region to divide during cleavage
c
to make the vegetal region denser, so that the egg always floats with its animal pole upward
d
to specify the future animal-vegetal body axis
e
to provide energy and nutrients for the developing embryo
d
to specify the future animal-vegetal body axis