1. The pressure in the deepest trench on earth is equivalent to placed on top of a person. a. 50 barbells
b. 50 elephants
c. 50 jumbo jets
d. 50 semi-trucks

d 50 semi-trucks

Explanation:

barbells are to light elephants are to hevy along with jumbo jets so it would most likely be semi-truck

the wetland preservation movement began in the u.s. in earnest with the clean water act (cwa) of 1972. although not specifically written to protect wetlands, the cwa is comprised of a series of regulations designed to prevent pollutants from contaminating u.s. waters.