When they are older and showing signs of dementia, usually a family member responsible for care will enforce the time limits.
Stuff like this is what gets you banned.
Burning less than 400 calories per hour is not the correct about the benefit of swimming. So option “D” is the correct option. In reality a person burns between 450 to 900 calories per hour while swimming. Swimming actually helps in the full body exercise of a person. This proves that option “B”” is not applicable. Swimming is also a great exercise for cross country training and so option “C” also is removed. Option “A” cannot be applied for this question as maximum number of joints are supported by the water.
18 protons, 22 neutrons, 18 electrons
There are 18 protons from the argon element. There 18 electrons because it is neutral, and 22 neutrons because 40 - 18 = 22.