You need carbon dioxide and oxygen because you need oxygen to breath and plants depend on carbon dioxide without it we would have plants and without plants we wouldn’t have food.
<span>C) from evidence gained by many experiments of many scientists</span>
The phrase "was really looking forward to it" creates the excited mood.
Hope this helps!
Acetyl choline.............
An aim identifies the purpose of the investigation. It is a straightforward expression of what the researcher is trying to find out from conducting an investigation.
The aim typically involves the word “investigate” or “investigation”. there it is :)
