Options: the period in which the moon completes an orbit around the earth, the period in which the moon completes an orbit around the earth and returns to the same positions in the sky, the period of rotation of moon, None of the above
Options: because of desiccation and mechanical damage to the tissues, because no photosynthesis takes place at such low temperature, because respiration ceases at such low temperature, because there is no transpiration
Benjamin Franklin was a prolific inventor. He invented the lightning rod, the Franklin stove, studied electricity, discovered the Gulf Stream, started the first library, and on and on. Among his many other inventions, what musical instrument did he invent?