this process helps to concentrate the urine and increase the volume of water in the blood. Aldosterone acts via a similar method as it acts to increase the production of 3 types of channels: 1) sodium channels.
This means that a new greenhouse costing $20,000 which has a useful life of 25 years would be depreciated at a rate of 8%, twice the straight line rate, of the undepreciated value each year as compared to taking 4% of the original cost each year as the annual depreciation allowance.
The greenhouse effect is the trapping of heat by the Earth's (or Venus') atmosphere. This allows our planet to remain at a temperature suitablke for life. Venus has an extremley thick atmosphere however. This effect on Venus causes the planet to be far too hot for life to form.