At infinity size of image formed by a convex lens is.​

Does work output exceed work input when a machine is used? a) yes, it does, as machines create energy. b) it depends on the type of machine used. c) no, it doesn’t, as machines are inefficient. d) no, it doesn’t, as machines cannot create energy.

Which is the correct symbol for an isotope of iodine with 53 protons and 78 neutrons?

What component of earth’s atmosphere exists entirely as a result of photosynthesis?