A really quick question!!

How does a comet change when it comes close to the sun

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

The plantation economy in the south produced a. equal opportunity for all whites and no illiteracy. b. low profits despite the enslavement of a great number of people. c. great profits and developed great educational institutions. d. great profits at the expense of cultural development and equal opportunity.