Can someone me with these science pages?

5: water cycle

6: use the image to help you:

Second page

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!!

hydrocarbons are organic compounds that contain only hydrogens and carbons. they can be saturated (those which contain only carbon-carbon single bonds) or unsaturated (those which contain carbon-carbon double or triple bonds) in nature. hydrocarbons can undergo several reactions like substitution, elimination etc.  

on substituting one or more hydrogen atoms in hydrocarbon it results in the formation of haloalkane. as the halogen atoms are large compared to the carbon and hydrogen atoms, due to which the molecular weight increases and the bond become polar because of presence electronegative halogen atom and results in the increase in boiling point of the haloalkane.

thus, the correct option is (b) that is the boiling point of the new compound increases on substituting a hydrogen atom with a halogen in a hydrocarbon.