Select the correct statement about the evolution of animals.

a) approximately half the phyla of living organisms are found in cambrian sediments.
b) the oldest generally accepted fossils of large animals range in age from 565 to 550 million years old.
c) no animal fossils are found in strata formed before the cambrian explosion.

Consider a u-tube whose arms are open to the atmosphere. now equal volumes of water and light oil (ρ = 49.3 lbm/ft3) are poured from different arms. a person blows from the oil side of the u-tube until the contact surface of the two fluids moves to the bottom of the u-tube, and therefore, the liquid levels in the two arms are the same. if the fluid height in each arm is 30 in, determine the gage pressure exerted by the person on the oil by blowing.