Which two domains contain microscopic, unicelluar organisms? *

Two friends at different locations want to communicate with each other by sending low energy signals. which of the following methods can they use to communicate? a) produce x-rays using colliding electrons and send them to radios, which capture sound b) send messages using infrared radiation, which travel in the form of waves c) send radio waves through intervening media like radio and television d) produce sound waves using microwaves from heated objects

How many molecules are found in 1.32 mol of nacl?

How many neutrons does an element have if its atomic number is 50 and its mass number is 166