HURRY ILL GIVE 10 POINTS The main duty of a vassal was to: a. Run his lords estate
b. Advise the king
c. Farm land owned by nobles d. Fight to defend his lords land

What do most climatologists see as a major cause of rising global temperatures? a. earth's closer proximity to the sun due to its gravitational pull b. greenhouse gases produced by burning fossil fuels c. rising ocean levels caused by melting polar ice sheets d. water pollution cause by industrial waste