A tree uses gas A to produce gas B. An animal uses gas B to produce gas A. What is gas B in this cycle?

A. oxygen

B. nitrogen

C. carbon dioxide

D. carbon monoxide

A Oxygen

Explanation:

this is because plants use carbon dioxide to produce oxygen and humans/animals use oxygen to produce carbon dioxide.

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.

it's c (engineer's do their work with mechanical stuff not on any living being)