How does a branched chain differ from a straight chain?

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

What are the chemical names of these compounds? ke: mg3n2: reset next

Describe at least two advantages and two disadvantages of using hydropower as a source of energy.