The movement of the muscles are divided into different planes or directional motions. Keep the movements of muscles in mind as you answer the questions below: A. Imagine you are trying to write your name without using your thumb. Why is opposition important?
B. Flexion is movement in the sagittal plane. What areas of the body are affected by flexion? If all of these joints that perform flexion do so at the same time, what position are you in? Be sure to include a general description of flexion motion

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.

the correct answer would be b) volume versus temperature, because they are also directly proportional.