Which statement describes a mixture

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 have the greenhouse gasses increased from the year 2000 to 2018

Ill give u brainliest pls how is mass of carbon conserved during cellular respiration