5: water cycle
6: use the image to help you:
BTB also known as Bromothymol blue (
1: Carbon Transfer through Snails, Bromothymol blue (BTB) is an indicator that turns yellow in the presence of carbon dioxide.
Meaning the snails produced carbon dioxide by breathing
2: The plant Elodea didnt produce any carbon dioxide beceause it needs to go threw photosynthesis
3: im unsure of this one
4: this im unsure of as well
im sorry im unable to answer number 3 and 4 but i hope the rest helps!!
the first one is C, I do believe.
the second one is also C, however, I'm not 100% sure on it, but it's worth a shot-
if these are wrong, i'm terribly sorry-
also, please post these in the biology section next time! °ω°