Explanation:
Oogenesis refers to the process of the formation of ovum cells from the oocyte. The oogenesis process involves the fusion of meiosis I and meiosis II. The oogenesis process begins even before the birth of a girl but is halted after meiosis I. The meiosis II forms the one functional ovum cell and one polar body.
This formation of unequal division is due to the reason that the polar body has to be degenerate while the ovum cell when formed will require the nutrition for the zygote as a result of which the receive more cytoplasm and organelles.
I would say the scientific method?
the heading underlined in blue gives answers to the last part
the part above the underlined heading and the first part on the first page help with the first qn (structure of dna)
am not sure about the second qn:(
but hope that helps