Answer:Classification, in biology, the establishment of a system of categories on the basis of presumed relationships among organisms. The science of biological classification is commonly called taxonomy.
For a mutation to affect evolution it has to be passed on to all the offspring if that is what you mean.
The pulmonary veins transport oxygenated blood back to the heart from the lungs, while the pulmonary arteries move deoxygenated blood from the heart to the lungs.)
8) is b.
im not sure if this is right though
18) is d
