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.

The slotted link is pinned at o, and as a result of rotation it drives the peg p along the horizontal guide. compute the magnitude of the velocity and acceleration of p along the horizontal guide. compute the magnitudes of the velocity and acceleration of p as a function of θ if θ=(3t) rad, where t is measured in seconds.

During physical science, ms. greene challenged her students to produce an energy transformation. james and jill wrapped a 4-inch nail with a coil of fifty turns of wire. they connected one end of the coil to one terminal of a knife switch. they connected the other terminal of the knife switch to the battery. finally, they connected the end of the coil to the other terminal of the battery. james held the tip of a 1-inch nail near the flat end of the 4-inch nail. jill closed the knife switch quickly and then opened it. the 1-inch nail was pulled toward the 4-inch nail. what is the best explanation of why the nail moved? a) electrical energy was converted to mechanical energy in the 1-inch nail. b) the 4-inch nail became an electromagnet and the magnetic force attracted the 1-inch nail. c) the electric current in the 4-inch nail was converted to mechanical energy in the 1-inch nail. d) the 4-inch nail had a positive charge and the 1-inch nail had a negative charge. opposites attracted.

What are atoms of the same element with varying number of neutrons