Fossil fuels and green house gases which burn holes in the ozone layer of the atmosphere causing global warming
Answer:
pets can help boost your mood
Explanation:
if you do not have any pets you could have slight depression if there is no one to cheer you up such as your companion
They are variables that cannot be changed or are purposefully not changed in an experiment.
Answer: I think its A.Harm
Protective eye goggles or glasses and/or face shields
