a chronic condition
It is unknown how long the incubation period is for Alzheimer's but what is known is that around 70% of the brain that is affected by the disease is damaged before the first symptom is usually noticed.
gestation
Gestation
acute
No, you don't have to have underarm hair to start your period. Everyone develops differently and at different speeds.
Increase the amplitude and the frequency
Clothing styles change gradually over a period. You should specify the period you are asking about.
Property with a longer production period
elephant
no. A period is a row of elements in the periodic table whose properties change gradually and predictably.
A period of rain is commonly referred to as a rainy spell or a rainy period.
Are you referring to an Olympiad?