COVID-19 pandemic, an advocacy group for the sector said Friday in seeking government relief.Schools incurred significant expenses in the switch to remote learning, in implementing enhanced health and safety measures, and in providing personal protective equipment, the Council of Ontario Universities said.At the same time, revenues from student residences, facilities and other sources took a hit, for a combined loss of roughly $1 billion for the 2020-2021 school year among the province’s 21 universities, the group said.Institutions made one-time cuts and savings to bring that number down by about half, and are now asking for sector-wide support from the province to help make up the difference, the organization said.