Q: Does "While a grazing species such as an elephant may travel many kilometers in a single day, grazing on many plants in the process, parasites form very close associations with their hosts, usually having only one or at most a few in their lifetime." provide a valid answer to "How many hosts do parasites typically have?"?
A: yes

Q: Does "After a year, she was won around to the marriage by Henry and Beatrice's promise to remain living with and attending her." provide a valid answer to "How was Victoria notified of her youngest son leopolds death?"?
A: no

Q: Does "The Norman frontiers had limited natural defences but were heavily reinforced with castles, such as Chateau Gaillard, at strategic points, built and maintained at considerable expense." provide a valid answer to "What castle was built at a strategic point?"?
A: yes

Q: Does "Mark Z. Jacobson, professor of civil and environmental engineering at Stanford University and director of its Atmosphere and Energy Program says producing all new energy with wind power, solar power, and hydropower by 2030 is feasible and existing energy supply arrangements could be replaced by 2050." provide a valid answer to "Who is a professor of civil and environmental engineering at Stanford University?"?
A:
yes