Africa experiences a high level of air pollution because it has more old vehicles on the road than industrialized regions do. select the best answer from the choices provided.
a. true
b. false

Which scientific design has both practical limitations and limitations due to scale? studying the effect of bleach on the growth of mold spores exposing cultures of duckweed to different intensities of light observing the replication of dna molecules with a hand lens using colored marbles to model a cross between two colors of rabbits