Evolution is often described as a slow, unobservable process. However, viruses continue to evolve rapidly. What best explains how the influenza virus evolves rapidly? A) Influenza viruses recombine with more pathogenic bacteria to produce new diseases. B) Influenza viruses target only cells that are resistant to detection by the immune system. C) Influenza viruses with mutations to evade host immune systems replicate more frequently than those that without the mutations. D) Influenza viruses combine with the human genome to silence genes of the immune system that can target influenza-infected cells.

Cells in the nervous system have a potential difference of 70 mv across the cell membrane separating the interior of the cell from the extracellular fluid. this potential difference is maintained by ion pumps that move charged ions across the membrane. is this an emf? select the correct answer and explanation. 1)no. the ion pumps cannot separate charges; thus, they cannot create a potential difference. 2)yes. the ion pumps cannot separate charges, but they still can create a potential difference. 3)yes. the ion pumps can actively separate charge; thus, they can create a potential difference. 4)no. the ion pumps can separate charges, but they cannot create a potential difference.