44) C) <span>mitosis
45) C) </span><span>mitochondria
46) C) Dominant
Hope this helps!</span>
Natural selection leads to increases in the mean fitness of populations and so will reduce the frequency of disease-associated alleles, but other evolutionary processes, such as mutation and gene flow, may introduce or increase the frequency of these deleterious alleles.
Antibiotics work by affecting things that bacterial cells have but human cells don't. ... The antibiotic penicillin works by keeping a bacterium from building a cell wall. Bacteria and human cells also differ in the structure of their cell membranes and the machinery they use to build proteins or copy DNA.
