21. What air pollution control devices reduce carbon monoxide and nitrogen oxide emissions from automobiles?
A. Aeration tanks
B. Catalytic converters
C. Fuel rods
D. Wet scrubbers

If 200.0g of copper(ll) sulfate react with an excess of zinc metal, what is the theoretical yield of copper

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

50 pts plz what is the physical state of matter of baking soda.