Single Family (R3 occupancy)- 2007 CBC- light and ventilation

Using the new 2007 CBC and dealing with R3 occupancy projects (single family dwellings)- I have the following questions:

Q1) Can occupied spaces in the R3 occupancy be provided with mechanical ventilation instead of natural ventilation (Section 1203.4)? Where are the values (air changes per hour) for the mechanical system noted in the CBC or CMC?

Q2) Can bathrooms in an R3 occupancy be provided wth natural ventilation (i.e. openable window) or a mechanical ventilation system is always required?

Q3) What are the design criteria for the mechanical ventilation system for R3 occupancy bathrooms? What code section in the CMC specifies the requirements (i.e. air changes per hour [ACH])?
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