Mary finds that she regularly retains water at a certain point in the menstrual cycle. What is chemically similar to aldosterone

Your question seems to me imprecise or poorly written, but compared to what is written I can clarify the following:

In our body we have a blood pressure regulating system through blood volume (which retains less or more fluid to increase or decrease blood volume and consequently blood pressure). This system is called renin-angiotensin-aldosterone what which participates the kidney, lung and capillaries with its own barometric receptors, is an incredible system within the body, which by increasing aldosterone promotes a retention of fluid at the level of the renal glomerulus (kidney) to maintain the blood pressure of the vessels and thus increase it.

Explanation:

It may happen to Mary that this system is activated in a menstrual situation since it may be that she loses too much liquid or blood volume through her menstruation and the body seeks to reward it along with other iron mechanisms for the transitory anemias that menstruation generates (that is this reason that it is not recommended to do blood tests in menstrual stages)

the tides are influenced by both the moon and the sun, it's easy to see that when the sun lines up with the moon and the earth, as during a new moon or full moon, the tidal effect is increased. these are known as spring tides, named not for the season, but for the fact that the water "springs" higher than normal. on the other hand, if the sun and the moon are 90 degrees apart in relation to an observer on earth as during the first quarter moon or third quarter moon, then high tides are not as high as they normally would be. this is because despite its greater distance, the sun's mass allows it to exert enough gravitational force on the oceans that it can negate some of the effects of the moon's pull. this phenomenon of lower high tides is called a neap tide. if you need more information on this topic visit moonconnection.com.

in the given question, the partial pressure is calculated by using the ideal gas equation, that is, pv = nrt

here, p is pressure, v is volume = 25 l, n is number of moles = 0.0104 moles, r is gas constant = -0.0821 l.atm / mol.k

t is temperature = 273 k

p = nrt / v

p = (0.0104 mol × 0.0821 l.atm / mol.k × 273 k) / 25 l

= 0.0093 atm