How does space affect our bones?

In the microgravity environment of space, astronauts lose on average 1% to 2% of their bone mineral density every month.

The amount of weight that bones must support is reduced to almost zero.Many bones that aid in movement are no longer subjected to the same stresses.

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this is a pretty broad question and can be a pretty lengthy answer. since 1900, women have gained a lot more rights and have become active in the workforce. with women being in the workforce, men play a larger role in family life. many family tasks are shared between men and women, whereas, women used to be the sole family caretakers.

that should get you started at least.