As the question title suggests, why do female humans invest more in parental care than male humans, from an evolutionary standpoint?

My guess is that the crux of this that males and females have different reproductive biology, but this by itself would not a very satisfying answer, due it not being very comprehensive.

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    $\begingroup$ Have you investigated closely related species? Do you know Bateman's principle and the theory of parental investment? $\endgroup$
    – Remi.b
    Mar 25 '17 at 15:23
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    $\begingroup$ Do you have a source that they do invest more? I have not seen research showing an non-cultural variation. $\endgroup$
    – John
    Mar 26 '17 at 14:48
  • $\begingroup$ I am voting to close as unclear until the OP adresses the questions in comments. $\endgroup$
    – Remi.b
    Mar 26 '17 at 17:37
  • $\begingroup$ "too broad"??? That's a GREAT QUESTION!! How can you erase it? Leave those inexpensive few kB for us to use our brains! $\endgroup$
    – Rodrigo
    Jul 5 '17 at 16:02
  • $\begingroup$ That's a BIOLOGY site. Most evolutionary questions are broad. How can we think biology, how can we think evolution, if "broad thinking" is not allowed? Biology is so close to philosophy, yet you keep pulling them apart! $\endgroup$
    – Rodrigo
    Jul 5 '17 at 16:04