Like you might have studied. Heated hair expands while colder air contracts. So, the sound isn't able to move as efficiently in cold air than it would in warmer air.
Q1: The answer is seasonal changes.
Q3: The answer is sodium.
Q4: Not sure, sorry.
Q5: And then I think it is A for this one, but I am not sure.
I was debating this question for the longest time and I came up with a conclusion.
No
Which of the following bio molecules typically contains both nitrogen and phosphate?
The answer to this question would be nucleic acids. That is because they contain a phosphate base and a nitrogen group.
