Which of the following questions is MOST LIKELY to bring up ethical concerns with the use of biotechnology?
How can biotechnology be used to address food security issues?
How can biotechnology be used to help manage infectious diseases?
How can biotechnology be used to address global problems such as climate
change?
How can biotechnology be used to increase or decrease certain genetic traits in
the human population?

burning of wood and coal

explanation:

the panel also concluded there's a better than 95 percent probability that human-produced greenhouse gases such as carbon dioxide, methane and nitrous oxide have caused much of the observed increase in earth's temperatures over the past 50 years.

hydrogen is a compound or a single element and a element is a pure substence that cannot be separated into simpler subtances

clorine is a compound its a chemical substance that forms when two or more different elements combine

so both hydrogen and clorine are compounds