What result in adaptation comes from natural selection?

. The images below show two separate theories of how organisms evolve.  Which question below directly corresponds to whether Lamarck or Darwin are correct about their theories of the mechanisms of evolution?       Why don’t the shorter neck giraffes feed on grasses and lower vegetation?   How would the shorter necked giraffes in Lamarck’s theory survive to reproduce and pass on the “need” for longer necks if they were unable to reach food?   Why won’t the taller necked giraffes in Darwin’s theory provide assistance to the shorter giraffes since they are the same species?   Will the smaller giraffes be more adapted to hide from predators since they wouldn’t be visible from greater distances?

Natural selection can sometimes help improve human health and other times is ineffective at improving human health. Explain one example of how selection has helped human health, and explain one example of how selection cannot help human health (including giving a reason why selection was or was not effective for each case). You can give hypothetical examples if you explain them well. A couple of sentences answer is fine.

Which of the following is true about natural selection? a) It always results in the evolution of new traits b) It always results in the strongest individuals surviving c) It always results in the fittest individuals reproducing d) It always results in the best-adapted individuals surviving