Candidates for the U. S. House of Representatives must be at least 25 years old, and candidates for the U. S. Senate must be at least how old? Select one: A. 35 B. 21 C. 30 D. 25

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