Calcium deficiency disease (hypocalcemia) --- like osteoporosis, osteopenia !!
The rain gauge is an instrument used by meteorologists to measure the amount of precipitation in a particular region in a particular amount of time.
The rain gauge is placed on the ground in order to collect the rain or the precipitation sample. The rain gauge is labelled with the quantities, which can be used to measure the amount of precipitation.
So, the correct answer is option (a). on or near the ground.
Because astrologers don't use tools , don't observe the planet.
I think it's A
the cell membrane contain protein molecules