If aqueous solutions of lead(II) nitrate and sodium sulfate, which insoluble precipitate is formed?
Select one:
a. NaNO3
b. Na2NO3
c. PbSO4
d. Pb2SO4
e. PbS

Which supports the idea that birds and butterflies both have wings but they do not have a common ancestor with wings? a. the wings are analogous structures that evolved differently and do not have a similar internal structure. b. the wings are homologous structures that evolved differently and do not have a similar internal structure. c. wings of birds are vestigial structures, but the wing structures of bats are not vestigial. d. wings of bats are vestigial structures, but the wing structures of birds are not vestigial

Aradio signal from a gps satellite take only about 0.067 seconds to reach a gps reciever. if the speed of light is about 300,000km/s, then approximately how far away is the reciever from from the satellite?

What is the approximate vapor pressure when the gas condenses at 70 degrees celsius