From what observations did Darwin infer that there must be a struggle.pdf
- 1. From what observations did Darwin infer that there must be a struggle for existence among organisms? populations are capable of tremendous growth in numbers, but most natural populations persist in a steady state. limited resources function to keep natural population numbers stable. there is natural variation among individuals. all three of the choices are correct. two of the choices are correct, Which of the following does not contribute to the development of AZT resistance in HIV virions? Some mutant forms of reverse transcriptase are better than others at distinguishing AZT from thymine. Reverse transcriptase makes errors while copying viral DNA sequences from the viral RNA genome. In individuals treated with AZT, virions with mutations that make them better than others at distinguishing AZT from thymine are able to replicate better. Without AZT treatment the virus will eventually kill the host. Artificial selection differs from natural selection in that with artificial selection, it is not possible to measure the selection differential none of the choices are correct natural selection occurs more rapidly because there are often multiple selective pressures on a population natural selection is more easily reversible than artificial selection artificial selection is easier to document