Science!
which of the following is natural gas used for in the united states?
a. pipe line fuel
b. vehicle fuel
c. electrical power production
d. commercial use

How does the fossil record provide evidence that the modern whale evolved from the anthracotheres? a) the modern whale looks like their ancestor the anthracotheres. b) the modern whale has all of the same structures as their ancestor. c) there is not enough evidence to suggest the the modern whale evolved from the anthracotheres. d) the anthracotheres has a structure that is still present in the modern whale, but is no longer of use to the modern whale.

All of these things can block a bronchus and cause collapse of a lung except

What are the wavelike contractions of smooth muscle that move food down the esophagus called